I am watching a tutorial about using Convert to Sheet Metal and then making multibody parts.  The concept is to take a solid, convert part of it to sheet metal and then roll it back to before the convert and do a Move/Copy and use the Copy function to create another body of the original and then do a separate convert to sheet metal on the original.  This will give multibodies of different parts of the original solid.

The tutorial shows this  - (the attached image with the white background).  It has a check box for Copy.

But when I do it it brings up this (the other attached image with grey background show "Bodies to Move" and no check box for Copy.

I can't figure out why.

STeve