In this tutorial, Ryan Schmidt demonstrates a quick-and-dirty way to set up a GeneratedDynamicMeshActor to Tick in the Editor, which will allow you to create a SubD Actor that auto-updates when a source mesh Actor is edited.
https://dev.epicgames.com/community/learning/tutorials/M6p5/unreal-engine-ue5-0-geometry-script-live-subd-with-editortick