MAYA: How to reuse parts of a Diffuse texture without overlapping UVs on top of it?

Well I have tried adding the new UV set in Maya and making sure that none of the faces overlap with its UV coloring But that seems to be giving me a headache. I want to try to make the UV set within UE4. Do you happen to know a tutorial around here that tells how to create a new UV set within UE?

just perhaps it would save time from re-opening asset files and re-exporting them.

Thanks