Hi, I'm trying to learn solidworks 2012.  I had a base mount for a

USB to wireless adapter at my desk, so I decided to try and

draw it as an introduction. Please see the image, it shows the

top side and bottom side.

I’ve been able to make the general outline and use “shell” to hollow

out the middle.  The problem I’ve run into is the cable relief area, shown

as the red arrows in the image.

I’ve sketched a rectangle and then used a blind extrude to create the

outline of the cable relief, but when I use the shell command, it goes

around the cable relief area.  How can I get the shell to slice through

the cable relief area and make it look more like the above image?

Matt M