So basically I have 2 objects and I want to make a hole by selecting 2 objects and then with the second object that was selected it cuts the first object and makes a hole.
Not exactly what I had in mind but still was helpfull. That Boolean tool is used in main editor for mapping and not in Hammer, but I found my own solution. I used Edge Cut Tool in Hammer instead of using another object to make for an example a door, and now you can delete the face to make a door, window etc.
