Mates in Sub-Assemblies

I have modeled a drawer slide with all the proper matesrequired to show the linear motion that a slide exhibits in reallife. It is obviously an assembly file.

I have inserted this slide assembly into another higher levelassembly.

However, the linear mates no longer work. Is there a work aroundfor this? Or, do I have to do all of the mates at this higherassembly level?SolidworksAssemblies