Well, I don't know if you'll think I'm the best now.
In order to fill in the field while on the add form, based on a selection made in a select list on the same form, you're going to need to use javascript. And I don't know javascript.
I can tell you how to get the value from the other database and add it after the record is submitted, but I can't tell you how to dynamically enter it into a field. I even looked at what I think is the best javascript site -- http://wsabstract.com/ -- but I didn't find anything there, either.
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JPD
In order to fill in the field while on the add form, based on a selection made in a select list on the same form, you're going to need to use javascript. And I don't know javascript.
I can tell you how to get the value from the other database and add it after the record is submitted, but I can't tell you how to dynamically enter it into a field. I even looked at what I think is the best javascript site -- http://wsabstract.com/ -- but I didn't find anything there, either.
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JPD