about what tltrude said: having made several brushes a single entity, you only have to select one of the brushes and then press ctrl+e to select all entity's brushes. Just in case you didn't know
Is there any way to connect brushes 2 one
sorry dont know what 2 look after in search.
Yes you can!!! But the option thats in the mohr that lets you merge() brushes is really a waste. It will merge two brushes into one if they are both the same thinkness and width. If they differ in either you will get "Cannot add a set of brushes with a concave hull.". What that means I dont know. Wish that option worked though....would really cut down on the faces
MOHAA's engine has a big don't built into it: concave brushes. So, when it says: "Cannot add a set of brushes with a concave hull," it saying that if you were to add those to brushes the result would be concave and therefore bad. Try making a concave brush by editing edges or verticies and you'll run into problems immediately.
The only exceptions are patch meshes and LOD terrain but those are really different cases.