Why have so many Address Books? Why not combine them into one and us Searches on State and any required UDF's to pull out the ones that are applicable for any given task?
We started with 5 Address Books and rolled them into one and have been very glad we did.
Hmmm ... your business, but why not have a UDF for "States worked in"? Then if you're sending a document that applies to Arizona you search for all clients where "State worked in" = AZ?
SamPeter, you add User Defined Fields and their associated "Items" under File > Set Up User-Defined Fields. There are entries for User-Defined Fields in the Help Index, and there is a chapter in the On-Line Help (PDF document) entitled Set Up User-Defined Fields For The Address Book. These are good places to get started, and there are other resources in the Knowledge Base as well.
If you have specific questions I'm sure we can all help, but UDF's are a core piece of the Max foundation - if you're not aware of how to use them in this context I'd suggest you need to do more background research on Max or hire a consultant to look at your usage overall. No harm no foul, but you get a lot more out of Max if it's structured right from the beginning. And in any case, merging multiple Address Books if you do decide to swtich is not a task for the faint of heart.
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