diff --git a/pyatlan/client/aio/asset.py b/pyatlan/client/aio/asset.py
index eb6c582a5..565000af2 100644
--- a/pyatlan/client/aio/asset.py
+++ b/pyatlan/client/aio/asset.py
@@ -388,7 +388,10 @@ async def _retrieve_connection_with_retry(guid):
 
     @validate_arguments
     async def save_merging_cm(
-        self, entity: Union[Asset, List[Asset]], replace_atlan_tags: bool = False
+        self,
+        entity: Union[Asset, List[Asset]],
+        replace_atlan_tags: bool = False,
+        append_atlan_tags: bool = False,
     ) -> AssetMutationResponse:
         """
         Async save with merging custom metadata.
@@ -398,6 +401,7 @@ async def save_merging_cm(
 
         :param entity: one or more assets to save
         :param replace_atlan_tags: whether to replace AtlanTags during an update (True) or not (False)
+        :param append_atlan_tags: whether to add/update/remove AtlanTags during an update (True) or not (False)
         :returns: details of the created or updated assets
         """
         return await self.save(
@@ -405,11 +409,15 @@ async def save_merging_cm(
             replace_atlan_tags=replace_atlan_tags,
             replace_custom_metadata=True,
             overwrite_custom_metadata=False,
+            append_atlan_tags=append_atlan_tags,
         )
 
     @validate_arguments
     async def update_merging_cm(
-        self, entity: Asset, replace_atlan_tags: bool = False
+        self,
+        entity: Asset,
+        replace_atlan_tags: bool = False,
+        append_atlan_tags: bool = False,
     ) -> AssetMutationResponse:
         """
         Async update with merging custom metadata.
@@ -419,6 +427,7 @@ async def update_merging_cm(
 
         :param entity: the asset to update
         :param replace_atlan_tags: whether to replace AtlanTags during an update (True) or not (False)
+        :param append_atlan_tags: whether to add/update/remove AtlanTags during an update (True) or not (False)
         :returns: details of the updated asset
         :raises NotFoundError: if the asset does not exist (will not create it)
         """
@@ -430,7 +439,9 @@ async def update_merging_cm(
             get_by_qualified_name_func=self.get_by_qualified_name,
         )
         return await self.save_merging_cm(
-            entity=entity, replace_atlan_tags=replace_atlan_tags
+            entity=entity,
+            replace_atlan_tags=replace_atlan_tags,
+            append_atlan_tags=append_atlan_tags,
         )
 
     @validate_arguments
diff --git a/pyatlan/client/aio/batch.py b/pyatlan/client/aio/batch.py
index b99444208..2ab1f3829 100644
--- a/pyatlan/client/aio/batch.py
+++ b/pyatlan/client/aio/batch.py
@@ -43,6 +43,7 @@ def __init__(
         case_insensitive: bool = False,
         table_view_agnostic: bool = False,
         creation_handling: AssetCreationHandling = AssetCreationHandling.FULL,
+        append_atlan_tags: bool = False,
     ):
         """
         Create a new async batch of assets to be bulk-saved.
@@ -68,10 +69,15 @@ def __init__(
             view if not found as a table, and vice versa)
         :param creation_handling: when allowing assets to be created,
             how to handle those creations (full assets or partial assets).
+        :param append_atlan_tags: if True, Atlan tags on assets in the batch
+            will be added/updated/removed using the add_or_update_classifications
+            and remove_classifications fields, without replacing all existing tags.
+            When True, replace_atlan_tags is ignored.
         """
         self._client: AsyncAtlanClient = client
         self._max_size: int = max_size
         self._replace_atlan_tags: bool = replace_atlan_tags
+        self._append_atlan_tags: bool = append_atlan_tags
         self._custom_metadata_handling: CustomMetadataHandling = (
             custom_metadata_handling
         )
@@ -320,7 +326,9 @@ async def flush(self) -> Optional[AssetMutationResponse]:
                 try:
                     if self._custom_metadata_handling == CustomMetadataHandling.IGNORE:
                         response = await self._client.asset.save(
-                            revised, replace_atlan_tags=self._replace_atlan_tags
+                            revised,
+                            replace_atlan_tags=self._replace_atlan_tags,
+                            append_atlan_tags=self._append_atlan_tags,
                         )
                     elif (
                         self._custom_metadata_handling
@@ -331,7 +339,9 @@ async def flush(self) -> Optional[AssetMutationResponse]:
                         )
                     elif self._custom_metadata_handling == CustomMetadataHandling.MERGE:
                         response = await self._client.asset.save_merging_cm(
-                            revised, replace_atlan_tags=self._replace_atlan_tags
+                            revised,
+                            replace_atlan_tags=self._replace_atlan_tags,
+                            append_atlan_tags=self._append_atlan_tags,
                         )
                     else:
                         raise ErrorCode.INVALID_PARAMETER_TYPE.exception_with_parameters(
diff --git a/pyatlan/client/asset.py b/pyatlan/client/asset.py
index cf7667e9a..f990ac690 100644
--- a/pyatlan/client/asset.py
+++ b/pyatlan/client/asset.py
@@ -490,7 +490,10 @@ def upsert_merging_cm(
 
     @validate_arguments
     def save_merging_cm(
-        self, entity: Union[Asset, List[Asset]], replace_atlan_tags: bool = False
+        self,
+        entity: Union[Asset, List[Asset]],
+        replace_atlan_tags: bool = False,
+        append_atlan_tags: bool = False,
     ) -> AssetMutationResponse:
         """
         If no asset exists, has the same behavior as the upsert() method, while also setting
@@ -499,6 +502,7 @@ def save_merging_cm(
 
         :param entity: one or more assets to save
         :param replace_atlan_tags: whether to replace AtlanTags during an update (True) or not (False)
+        :param append_atlan_tags: whether to add/update/remove AtlanTags during an update (True) or not (False)
         :returns: details of the created or updated assets
         """
         return self.save(
@@ -506,11 +510,15 @@ def save_merging_cm(
             replace_atlan_tags=replace_atlan_tags,
             replace_custom_metadata=True,
             overwrite_custom_metadata=False,
+            append_atlan_tags=append_atlan_tags,
         )
 
     @validate_arguments
     def update_merging_cm(
-        self, entity: Asset, replace_atlan_tags: bool = False
+        self,
+        entity: Asset,
+        replace_atlan_tags: bool = False,
+        append_atlan_tags: bool = False,
     ) -> AssetMutationResponse:
         """
         If no asset exists, fails with a NotFoundError. Will merge any provided
@@ -519,6 +527,7 @@ def update_merging_cm(
 
         :param entity: the asset to update
         :param replace_atlan_tags: whether to replace AtlanTags during an update (True) or not (False)
+        :param append_atlan_tags: whether to add/update/remove AtlanTags during an update (True) or not (False)
         :returns: details of the updated asset
         :raises NotFoundError: if the asset does not exist (will not create it)
         """
@@ -528,7 +537,9 @@ def update_merging_cm(
             get_by_qualified_name_func=self.get_by_qualified_name,
         )
         return self.save_merging_cm(
-            entity=entity, replace_atlan_tags=replace_atlan_tags
+            entity=entity,
+            replace_atlan_tags=replace_atlan_tags,
+            append_atlan_tags=append_atlan_tags,
         )
 
     @validate_arguments
@@ -2201,6 +2212,7 @@ def __init__(
         case_insensitive: bool = False,
         table_view_agnostic: bool = False,
         creation_handling: AssetCreationHandling = AssetCreationHandling.FULL,
+        append_atlan_tags: bool = False,
     ):
         """
         Create a new batch of assets to be bulk-saved.
@@ -2226,10 +2238,15 @@ def __init__(
             view if not found as a table, and vice versa)
         :param creation_handling: when allowing assets to be created,
             how to handle those creations (full assets or partial assets).
+        :param append_atlan_tags: if True, Atlan tags on assets in the batch
+            will be added/updated/removed using the add_or_update_classifications
+            and remove_classifications fields, without replacing all existing tags.
+            When True, replace_atlan_tags is ignored.
         """
         self._client: AtlanClient = client
         self._max_size: int = max_size
         self._replace_atlan_tags: bool = replace_atlan_tags
+        self._append_atlan_tags: bool = append_atlan_tags
         self._custom_metadata_handling: CustomMetadataHandling = (
             custom_metadata_handling
         )
@@ -2480,7 +2497,9 @@ def flush(self) -> Optional[AssetMutationResponse]:
                 try:
                     if self._custom_metadata_handling == CustomMetadataHandling.IGNORE:
                         response = self._client.asset.save(
-                            revised, replace_atlan_tags=self._replace_atlan_tags
+                            revised,
+                            replace_atlan_tags=self._replace_atlan_tags,
+                            append_atlan_tags=self._append_atlan_tags,
                         )
                     elif (
                         self._custom_metadata_handling
@@ -2491,7 +2510,9 @@ def flush(self) -> Optional[AssetMutationResponse]:
                         )
                     elif self._custom_metadata_handling == CustomMetadataHandling.MERGE:
                         response = self._client.asset.save_merging_cm(
-                            revised, replace_atlan_tags=self._replace_atlan_tags
+                            revised,
+                            replace_atlan_tags=self._replace_atlan_tags,
+                            append_atlan_tags=self._append_atlan_tags,
                         )
                     else:
                         raise ErrorCode.INVALID_PARAMETER_TYPE.exception_with_parameters(