[oXygen-user] Creating a custom menu

Hello, I've searched through the forum and email archive for similar queries but have found nothing. If this has been covered previously, I apologize for the duplication. I am running Editor 10.3. I would like to create a custom menu with several actions, including an external validation against a specific RNG schema and several transformation scenarios. In particular the RNG external validation is an action that I repeat frequently and I'd like to avoid the step of selecting the schema each time I initiate an external validation after reopening Oxygen. Many thanks, Mike