Enhancement Request - Sharing Entities from "Top" Cube

I've had requests from our finance team about sharing entities from our "Top" cube into another.

Our application is in a mature phase now and many of the entities from our top cube will be moving into cubes of their own. 

Currently, we only have two options:

Option1: Completely clear the entity, delete, and the create in the new cube and reload the data. 

Option2: Rename the entity i.e "EntityA_Old" and create a new entity in the new cube with the old name "EntityA"

It would be great if there were a better option