Hi, Barb,
You can use Group Security to do this. Each user that would be 'coded' to a separate location, could belong to a different group.
Within each group, you are able to define Order and Customer templates. On the Order template for Location, you would select to Skip Field. As Location is a required field within OE, you would ensure that you selected the location code they are to be using from the dropdown field.
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Regards,
Softrak Tech Support