Cut Profile Command/Button

The CUT PROFILE command will replace a lot of line work and filled regions in some cases.You can find cut profile under the VIEW ribbon.  NOTE: These changes only occur as 2D lines in the view.  You will see them nowhere else in the project.

In this case I want the slab to pour on top of the footing. With the cut profile tool I can change the outline of the slab without using linework or filled regions.

When opening the command you may pick to edit a face or boundary between items on the green "whatever it's called bar" below the ribbon.  Just draw the changes to the slab boundary.  Make sure the blue arrow in the middle of the line is pointing to the side you want to keep.

FINISH and we've got...

BOOM....Free Money

Here's a video of it.  Use it to learn a little more or fall asleep.  It's effective at both.