'Spawn' New Map

XMind has the capability to create a new map from a current map. This starts the new map on a separate page, with two-way links that enable you to jump back and forth. Both maps are actually sheets in the same file. I found this to be an incredibly useful function. I would like to see this implemented in MM. Currently I have to generate separate files and manually link them: far less efficient and not helpful if all the 'sheets' are actually related.