I could use some advice

[ddouglass]

Very easily done. I am assuming you are storing the imported songs on the external drives. Import all the CDGs on one computer (external hard drive). Then take that External and hook it up to each of the other computers along with their own primary external. Copy the .KMA files from that external to the primary one and then rebuild the database in Hoster. Do this for each of the other 3 computers.
This way the BookIDs for all 4 Hosters will all be the same and you won't risk ending up with duplicate IDs. This also makes it easier to print your books if they are all the same.
I don't know how you plan to use the 4 computers (4separate shows or 2 shows with backup computers), but I do have to caution you that you must own the original CDG discs for each computer you are going to use for individual shows in order to be legal.