Solutions
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signmanbob's post in Scenery Config Editor question was marked as the answerEverything is done within the Scenery Config Editor. When you select "Save", it will make the changes within the FSX Library. You don't have to do anything else.
Make your group and "File > Save", then close the Scenery Config Editor, and go fly. Make all of your scenery selections within the Scenery Config and don't even use the FSX Library anymore.