Importing Patch & User Defined Fixtures

I have a show file that already has some user defined fixtures in the library and I don't want to lose these.  However if I create a new show they are gone.  So I then tried clearing the cues and patch from the current file which left the fixtures.  However when I went to import my patch (via Lightwright exporting to ASCII) the patch shows up all well and good but the user defined fixtures are gone again.

Where am I going wrong?

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