Set Rigid or Flexible in DT

I have an assembly with a sub assembly in it. My design tableis all set up, everything is just as I want it except...

I cannot find the header for setting whether a subassembly is Rigidor Flexible(found in the properties of the subassembly). Is thissomething that can be set in a DT?

I tried changing one and opening the DT to see if it would pop upin the list of things to add, but it doesn't show up there.

Any and all help is appreciated.

Thanks
MistySolidworksConfigurations design Tables