Modify User Templates - Change Value in Memeber of Field

Modify User Templates - Change Value in Memeber of Field

Hi Everyone.
 
I am trying to create a modify user template that will change a value in the Member of field without removing all the other values.
 
example if a user is a member of Group A, Group B, and Group C.  I want to be able to create a template to modify the user so that if they have Group B it needs to be replaced with Group D.
 
The only way I have found to do this if it removes all the other groups and replaces it with Group D. I need to be able just replace one specific group with another and leaving everything else the same in the Member of Field.
 
Regards
Andrew

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