Replace Subsystem(s)

Setup Manage Assemblies Replace Subsystem            Shared Dialog Box
Replaces one or more subsystems in an assembly with one or more new subsystems. Learn more.
 
For the option:
Do the following:
Assembly Name
Select the assembly you wish to modify. The menu lists all assemblies open in the session.
Subsystem(s) to remove
Select the subsystems you want to replace.
Subsystem(s) to add
Select subsystems:
To search/browse for a subsystem, right-click the text box next to .
To select a subsystem that is open in the current session, right-click in the field next to and select a subsystem.
Variant Options
Select one of the following options:
Update existing variant
Create new variant (and supply a new variant name)
Don't update variants