I see! Thank you for your reply, Luis!
If its not to much to ask, do I need to simulate them together again, after I got them stable?
I was doing exactly was you proposed, but my idea was to export the end results of each simulation with Hec-GeoRAS and then create a unique flood map. My concerns were brought up when i saw the differents stages results for the XS on the breaking point, since than I would not be able to join the maps or, at least, wouldn’t know witch stage to use at that XS!
Again, thank you for your help!