Boundary Fill problem

[TheCADWhisperer]

Not sure if this is a new problem in new build or if I am not using the tool correclty.

I am trying to remove the geometry between the two surface bodies.

I think I have done this in the past on this same part (modeled in different way) but now I cannot get it to work.

As soon as I try to Select Cells the solid and the surface bodies vanish.

[TheCADWhisperer · Accepted solution]

OK, 

I figured out what I was doing wrong.

For the first selection I had only selected the "cutting surface bodies", I hadn't selected the solid body as well.