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That should not be too hard:

I created two spaces:

Make sure you select the Hide rest of model (It makes it easier)

Now select one of the spaces and double click it. You should end up with one visible space:

click left to the lower left corner of the space and drag all over it to select the space. Now cut the selection. The space should vanish and should be eliminated from the inspector window. The other space should reappear after you click anywhere on the model.

Now select the remaining space by double clicking it. Last you need to use the paste in place to get the first space merged into the other one:

That's about it.