When creating a new uvmap for an object the previous uvmaps are included. How do I start without them? I'm having a hard time managing my uvmaps.  I keep getting artifacts from previous uvmaps showing up.  I unwrap only a portion of my object to place a decal.  I make a new uvmap and the previous one shows up and so on.  And I can't remove it.  I need help bad.  Either this is buggy or I'm doing something fundamentally wrong.

So I just made a new uvmap "UVMap" and it auto included the other uvmaps.  And I can't figure out how to get rid of them.  Why they appear.   

Any help is greatly appreciated.
Creating a new uvmap, duplicates the selected uvmap.

You can change any uvmap layout without altering any other uvmaps, just choose a different mapping type from the unwrap menu or adjust the uv positions the way you want them.

If you want to completely reset a uvmap - in edit mode select all A and then press U and select Reset.