Here is some sample code for the iLogic method, in case you decide to go that route. I would suggest making this an external rule, and just running it manually when you need to as a shortcut.
As written, this would set all components (both parts and assemblies) to their Default representation, with associativity turned on. If you wanted it to only affect subassemblies and not parts, that could be done as well, but this example isn't quite that smart. I quickly made this code from a rule I already had that sets all components to a View Rep called "Painted". All I changed to mock up your scenario was the name of the View Rep. So while I know that it should run properly, it doesn't do anything special that my original didn't.
Dim doc As AssemblyDocument = ThisDoc.Document
Dim cdef As ComponentDefinition = doc.ComponentDefinition
Dim occ As Inventor.ComponentOccurrence
For Each occ In cdef.Occurrences
Try
occ.SetDesignViewRepresentation("Default", True, True)
Catch
End Try
Next
At my company, we have two rules like this for setting up commonly-used View Representations. The other one is a little more complicated, because it sets assemblies to one of two representations based on some If/Then logic, rather than making them all the same. I used the simpler one to base my example on, both because it's easier to understand as a sample, and because it's closer to what I think you would want anyway.
