[OBSOLETE] Remotec ZRC-90 Scene Master - Button Device Supporting 24 Unique Button Commands (see post 177 for 2021 app version)

I’m not sure I understand your question, but if you read the community custom code FAQ, it lists the steps you need to go through to use a custom DTH:

[OBSOLETE] FAQ: An Overview of Using Custom Code in SmartThings (SmartThings Classic, Groovy Code)