Subtract an imported mesh?

How i can subtract with the brush an imported mesh for a 3D Software.
This is exactly what i want, i’ve created a modular walls etc and i don’t want to create a modular wall with windows to each type of wall, there’s anyway than i can substrack with the brush an imported mesh?

I will just post the link to the answer: https://forums.unrealengine/showthread.php?48395-Subtract-an-imported-mesh :slight_smile:

“It is not possible to subtract from a mesh”