Newbie nees help - subtraction

Hi,

I've been using Solid Works for about a week, (I have ~20 years experience with other CAD packages).

I have two components I brought into an assembly that I need to subtract. I saw a previous post about a Combined Feature command but I can't even find it. What module is it under? These parts were imported from Rhino using STEP203 if that makes any difference.

Thanks for your help,

Doug

SolidworksParts And Features