Is the shipping address the same as the billing address?  If so, use custom sales order and invoice forms.  Replace the Bill-To address block with the Ship-To address block.  You could even use invoice forms unique to the customer or location and completely override.  

Alternatively, you could build logic into the Bill-To address block and display or suppress based upon the customer number and ship-to address id.  You could have multiple Bill-to address blocks that overlap and only print the specific one appropriate for the transaction.  This would allow you to use a single form for all customers.  This is important as you have to select the invoice and / or sales order form when you process.  You can't tie the form to the customer or ship-to location.

Thanks for all the responses. Sounds like we are going to have to do some customizations to get this to work. The reference to 'build logic', does that mean user-defined scripts?

Thanks for all the responses. Sounds like we are going to have to do some customizations to get this to work. The reference to 'build logic', does that mean user-defined scripts?

Would the use of the National Accounts feature be of use here?  The different ship-to's would have to be set up as a separate customer record.

I checked into National Accounts and didn't think that would work. We need to issue one sales order to ship to multiple locations that have different bill-to-addresses.

You can add Bill-to address UDF's within the Ship-To file. This will give you a Bill-to for each ship-to. You can the easily place those on the appropriate forms.

thanks, Kenny. That sounds like a fairly easy solution.