Hi Vickie,
Isn't the drop ship information for the PO actually a customer of yours? Wouldn't you want their contact information?
In any event, you can add Ship To codes and records "on the fly" as you create the PO. Why not develop a method of generating unique codes every day. For example, you could use "Ymmddx" where "Y" is the year, "mm" is the month,"dd" is the day and "x" is 0-9,"A-Z" for 36 new customers / day. Or use your UserId and 3 digit codes, allowing 1000 addresses per user until you need to start again.
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Andrew Bates