Thanks for your help but I still can not find a negative gate even in the Misc Digital area of the Master database. These are not NOR or NAND as they have inversion on the output. I am looking for negative devices that have inversion on the input. For example swapping an OR gate for its De Morgan equivalent Negative AND.
Would you be able to share the Dual Gates you created? Is there a way to export and import them? I wanted to be able to place gates with demorgan equivalents to teach bubble-matched schematic drawing techniques. I'd love to use a library of these gates if someone has already gone to the trouble of creating them.