@Mottoc, I tried that but I had to Dynamesh and then split them again, for some reason it doesn’t do it automatically.
Also what do the other icons on the subtool mean? the second means the subtool will be extracted from the one below right?
The other way I do this, is insert the shape you want to subtract with an Insert Brush while having Dynamesh active and holding Alt
Press Double in Display properties if you don’t want it to look like an empty shape
Align the shape however you want and then in Dynamesh click Sub and then Dynamesh
This so far has worked the best for me but in true Zbrush fashion a simple boolean takes like
10 steps to complete
so I was looking for an easier way