How to vary part configurations in assembly design table?

Hi,

Quick question, how do I vary part configurations in an assembly design table? I have an assembly made out of a few parts that have various configurations, and I want to adjust the configuration of a part for a few of them.\

Also, if I am not able to adjust part configurations in an assembly design table, how should I proceed? Can I save configurations of an assembly outside the references of the assembly? Like can I just extract & save 1 configuration?

Any input appreciated! 

SolidworksModeling And Assemblies