You can use Fo3Edit to do this very quickly and easily (tutorial/tool links in my sig).
Just load your mod into Fo3Edit, click on Header in the Left-Hand column and you'll get all the details in the Right-hand window. Just left-click the master record you want to delete, remove it, then quit the program - it will as you to save, check the Box and click OK.
That should do the trick.
Luck,
Miax
I would like to first start with thanking you for the response.
ok, opened Fo3Edit (ver 2.5.1) loaded my mod, clicked on header, got details... went to "Mast - Filename" left clicked to highlight, right clicked and there is no "Remove" option. I however did the "Edit" option to take it out. Geck and Fo3 at this point did not recognize my mod. I fortunatly had a backup. I am now where I started. Anchorage assotiated with my mod. Any other ideas?