steelgoose,
You again demonstrated that there is a solution in CopperCAM and also provided me with some tips on how to achieve this.
So I guess now I'll have to learn some G-Code and I found a good place for it on the website CNC Coockbook.
Unfortunately there seems not to be a forum dedicated to GRBL, then issues related to this are scattered in several forums, chosen according to the initial purpose of the discussion.
I am very grateful that you have shared your knowledge, that you have not left direct this issue to the void. I believe you have also collaborated with the evolution of Fritzing, this excellent tool.