[DRG]

You could simply build the custom HQ anywhere in the OOB......then buy it for the scenario.... Scenarios are only concerned with UNITS. The formation is just a shell...(in scenarios only this does NOT apply to OOB creation )........so you could build your custom HQ in a free slot, buy it for your scenario then delete it from your OOB (so you do NOT need to change the existing one) and the scenario will treat it just like a normal formation

That can be done for anything...you could build custom formations all you like then delete them after they have been bought...name them how you like and that will transfer to the sceanrio..........when you are done just delete them from the main OOB......but this applys to formations ONLY in scearios.....you cannot use this trick with units.