[Zubersoft]

I would recommend using the library sync feature to merge the libraries together on the tablet. These are the basic instructions:

1) Tap the three dots at the top right corner of the library screen and then "Sync Library->Sync to another device"
2) Set one device as the Server, the other as the client.
3) Set the sync type to "Two-way".
4) Tap Create Server on the server and on the Client side, tap the entry that shows up in the list and click "Connect"

This will sync the two devices and their libraries will be merged together. Now both devices will have the combined library. 

Mike