Restraining part of a plane

I am using COSMOSXpress and am trying to restrain my partwhere it will actually be restrained when in use. The only problemis the area to be restrained is only a section of a plane on thepart. It only lets me restrain the whole plane, and when I try toremodel my part to get two seperate planes, it always combinesthem. Any suggestions?SolidworksMotion Studies