how to include your custom missions on the BONUS menu in skirmish?

[leo.civil.uefs]

I would like to, I know how to do a mod and all and actually know how to have one of my custom missions shown in the BONUS menu but if so the vanilla BARBECUE mission dissapears and I cant have more than 1 of my ones shown in that menu, I guess it is something about changing the name of the mission folder, but I tried lots of names 01_xxx-xxx, 02_xx... etc.

So, anyone knows?