Magic Sheet merge

Two questions:

Is there any way to copy things from one magic sheet and paste them into another?

When I merge one show file magic sheet into an open show only the one I merged shows up.  It replaces the magic sheet for the open show.  I thought whatever I merge would show up in the Magic Sheet Browser.  How can I have several magic sheets available from different show files?  This also goes with the first question as being able to copy from one and paste into another.

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