1. Open the "revan.uti" with Fred Tetra's KotOR Tool (
http://kotortool.home.comcast.net/index.html) (Under the File menu is an option for Open GFF Files)
2. Click the Properties Tab. You should now have a list of the mask's properties.
3. Highlight the row you want to delete by clicking the 'empty' rectangle to the left of the specific property you no longer want and press your 'delete' (not backspace) key on your keyboard...
**- If you want to edit, rather than delete, just double-click the rectangle and the Item Property Editor window will open up. From there you can adjust appropriately...
When you're finshed, click the Save button (lower right) and save the file as "revan.uti". Drop the file in your override and your done!
Welcome to the forums! :D