How to compile the linear assembly *.sa files in CCS version 4?

I used CCS-v3.3 before, and when you add the *.sa linear assembly files into the active project, and when compiling, the CCS will call the cgtools to compile the *.sa file, but I don't find any tool to compile the sa files in CCS v4? Could anyone tell me how to compile sa files in CCSv4? Thanks!