I see that when I use the paint brush I can effect one surface. However when I use the pen tool it creates separate surfaces. This is tricky as I am working on project of a building that has many small windows. Originally I did the paintbrush to mock up the project. This made tons of points per brush stroke that is taking forever to edit/clean up, plus the brush strokes seem to effect each other, not always, but often. Meaning when I try to adjust or remove the curve points it sometimes links to another brushstroke somewhere else in the project.
So if it's not in here can we please get a means in which to "group surfaces" and then maybe a merge or flatten together option? I can see linking them together, but that would add a lot more traffic to the Layers Panel. That's possible if maybe you could just collapse the linked surfaces.