For now I`m sure that is possible to do my boolean job in MoI. I had main problem with heavy load and lag but after your deep explanation I will lower density to have better performance in MoI.

My current mesh in work includes about 20 different cutters and adders. Some of them are triangulated. I need to change them to subd and then I will do great test in MoI. Next I will build mold over it inside MoI with keeping my draft angles with Cplanes (in Modo it names workplanes).

Thank Michael for your oustanding help.