Could you attach a pack and go of your work?
It's difficult to say for sure without know what kind of changes you made, but see if How do I set a configuration specific dimension or value? will help, especially the second option shown. I discussed making dimensions configuration specific there, but the same method can be used on features to suppress them in selected configurations.
Glenn Schroeder has got it right for dimensions, pattern variables, etc.
In addition if you don't want new configurations to affect the existing one(s) do the following:
- Right click on the first configuration name and choose Properties.
- Near the bottom is a section called "Advanced Options". Check the box next to both of the following options:
- "Suppress new features and mates"
- "Suppress new components"