I want to KEEP nested xrefs

Hi all

I currently have some house master drawings split into the following:

1.A base plan with some common/repeatedelements and also some xrefs.

2.Individual "Facade" drawings which all reference the base plan.

I need to be able to have the user open a given "Facade" drawing and bind the base plan (using "insert" option) BUT I would like to be able to keep the nested xrefs. Is this possible? Any assistance would be greatly appreciated.

I run AutoCAD 2010 on WIndows 7 professional.

Thanks

Alex