Thank you for your fast response. I don't know if that's exactly what I ment (maybe it is).

I think I need to program in Microsoft Word with Visual Basics.

My wish is that there is a relationship between the different checkboxes. So if I check "A" then I want that "B" and "C" are also automatically checked. And if I check "B" I want that "C" is also automatically checked. When I check "C" then I want that just "C" is checked.

☒ A
☐ B
☐ C