I use SW2012, and I would like the finished dimensions (L x W x H) to be automatically filled in in my BOMs. I know how to do it for example L x W because I click on the 2 sides of my sketch, but the 3rd I don't know.
So you have to go through an equation (to add the 2 sides), or use the extrusion differently, by extruding in one direction and shifting the original plane (see image)