OK, back with new approach. I mis-understood Rashaids method. He means to delete from the program folder rather than from the program itself. That works then. Select the items you want to save and export them to a separate folder so they can be re-loaded. Then go to programs>daz>bryce>presets and delete the offending section. Re-open Bryce, select the section heading and click on the - minus key to delete the section heading. You can then reload the previously saved mats/objects in another heading or back into the same heading as you wish.

 

Mike