Thanks for your suggestion! It has indeed come up more often, in many different ways. Here are some similar questions that will also be covered by this feature: https://community.triggre.com/t/copying-parts-within-a-user-flow-or-flow-part and https://community.triggre.com/t/copying-parts-of-user-flows/
We have a more advanced idea on our roadmap, as you can see here: Triggre Roadmap | New features coming to Triggre
It’s not the highest priority, and it also requires some other changes to be built first. But rest assured, we have it on our radar!