diff --git a/Client-Side Components/Catalog Client Script/Mandatory Subcategory based on Category/README.md b/Client-Side Components/Catalog Client Script/Mandatory Subcategory based on Category/README.md
new file mode 100644
index 0000000000..ff62b69127
--- /dev/null
+++ b/Client-Side Components/Catalog Client Script/Mandatory Subcategory based on Category/README.md	
@@ -0,0 +1,14 @@
+Client Script: Make Subcategory Mandatory Based on Category
+
+Overview:
+This client script ensures that the Subcategory field becomes mandatory when a Category is selected on the Incident form.
+
+Implementation Details:
+
+Create a new Client Script with the following configuration:
+
+Type: OnChange
+Table: incident
+Field: category
+
+Add the provided script in the file mandatory_subcategory.js.
diff --git a/Client-Side Components/Catalog Client Script/Mandatory Subcategory based on Category/mandatory_subcategory.js b/Client-Side Components/Catalog Client Script/Mandatory Subcategory based on Category/mandatory_subcategory.js
new file mode 100644
index 0000000000..094b966be3
--- /dev/null
+++ b/Client-Side Components/Catalog Client Script/Mandatory Subcategory based on Category/mandatory_subcategory.js	
@@ -0,0 +1,17 @@
+// Type: onChange
+// Table: incident
+// Field: category
+function onChange(control, oldValue, newValue, isLoading) {
+    if (isLoading || newValue == '') {
+        return;
+    }
+    
+    // Make subcategory mandatory when category is selected
+    if (newValue=="<category_name>") {
+        g_form.setMandatory('subcategory', true);
+        g_form.showFieldMsg('subcategory', 'Please select a subcategory', 'info');
+    } else {
+        g_form.setMandatory('subcategory', false);
+        g_form.hideFieldMsg('subcategory');
+    }
+}