Well, there is a trick for laying out the holes, at least the way I made my unique cribbage board, but it’s not something you can do in Carbide Create. It’s not too difficult, however, in Inkscape, which is a free vector drawing app that makes an excellent partner to Carbide Create. (You do the complex design steps in Inkscape, then save an SVG and import it into Carbide Create.)
I did a little writeup of how I designed that custom cribbage board, including my process for the holes. (Click “Hole Group Setup”, “Path Design”, and “Placing the holes” to expand the sections.) Here’s a link to the thread: