map editor - double system

[Ruatha]

If I want to place one system atop of another and have warp points leading into both systems, how do I do?
Is it doable?
Now when I create a new system ontop of another I can't edit it unless I delete the first system.
Id like two systems ontop of eachother with the following wormhole directions:

-0-

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O
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Making it look like this on the starmap:

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-O-
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