How to make Non Persistent Entities (on the fly) with the model SDK?

Hi guys   Need to expand my domain model on the fly and I saw there are possibilities with the Model SDK API to adjust the domain model. But seen I am not familiar with it I could use some guidance.   Anyone some explicit steps pls?   thanks
1 answers

If you want to expand your domain model at run time, you can't: you can add entities through the SDK, but you will still need to create a deployment archive and deploy it to an environment, resulting in downtime.