[Zubersoft]

You are correct - you will have to filter on the songs you want to remove, select them all and then delete them all at once. There isn't an option at the moment to move songs between libraries - you have to export them from one, delete them from that one, then import them in the other. 

You do not want to batch import a .msf file - you want to use Import->Local File and select that one .msf file. Batch importing a directory containing a .msf file will import all files in that folder along with any subdirectories if that option is enabled.

You said you weren't able to import all the files you exported - what exactly does that mean? Are you encountering an error of some kind? Was the export successful before you tried importing the .msf?

Mike