Designing forms that can adapt to changing business requirements are key to having a scalable planning application.  In the December 2020 planning update, Oracle has added the ability to use UDAs (user-defined attributes) in planning input forms. The UDA menu can be found in the member selection screen in the variables tab at the bottom.  Using existing UDAs can make forms easier to maintain by reducing alternate hierarchies and substitution variables.  Give it a try and make your application easier to use.