Steps to follow :
Add association or attribute to store user’s selection
Example:
Entity: UserSettings
Attribute/association: PreferredDepartment → Department (the Combo Box source).
Set the default value using a microflow/nanoflow
On page load or in data source microflow:
Retrieve the current user ($currentUser).
Retrieve or create their related object (like UserSettings).
Based on the user’s info, set the default reference:
change UserSettings set UserSettings/PreferredDepartment = DepartmentObject
Return that object as the page parameter.
In the page Combo Box
Data source: Association or microflow returning available options.
Value (reference): The attribute you set above (e.g., PreferredDepartment).
Display attribute: The name to show (e.g., DepartmentName).
Result
When the page opens, the Combo Box automatically shows the default value linked to the user.
The user can still manually change it.