 So you bought two different awesome curved brushes and you want to combine them to one. Not a problem. Let's say you have two different belt brushes and they're so similar you really just want them to be a single brush. To combine them open the smaller one and under brush create copy meshes. Go to the main brush, hit paste append, you're done. You can also do this one at a time by using the copy one mesh instead or at any point delete a mesh you don't want to include by clicking here. Once you have your new combined brush just go up and save it the same way you always do. As long as it's in this file you can use it in your custom UI. I hope that helps. Man as always hope you have a fantastic day and I'll see you around.