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.

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?

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.