Hi Michael
Yes that works too and maybe a little more easy :)
But the guy want to use a box :)

maybe the mix is more easy again
Use the Union box for "erase" the internal (because selection can be complex) and your double erase for fill the hole :)

Thanks a lot Michael, and thank you to come here.
Very great solution. In fact, I look for the best and simple solution to resolve my problem, and it seems it's this solution the more simple and efficient. I didn't know this solution, and it's a very good function.
Thanks a lot Michael and Pilou.


... and no problem for your english, my Pilou is here to translate :-)