Reverse Hole in XYZMaker

[a0063576]

I'm trying to round the corners of a rectangle in XYZMaker. Using the "hole" function I'm leaving the corners and removing the bulk of the rectangle. I need to reverse that... In this photo, I'm wanting to remove those red corners and leave the rest. Any suggestions?

[a0063576]

Figured it out...

Referencing that image, I had to make a much larger polygon (say, a cube), and cut that sphere out of the center. So now I have a cube with a round cavity in the middle.

Then, I moved the cube left, right, up and down until the corners of my base piece that I wanted to remove stuck outside that cavity. Then I was able to "cut" the cube and leave the base piece, sans corners.

I did all of this viewing in 3d sketch mode, not solid.

It was a backwards process, but it worked. And I've been able to apply the same "process" to other designs.

Hope this helps someone else.