how to set a certain format

I have what I believe to be a very simple problem for all of you who know
Access better than me. I am using Access 2007 and have a field in my table
where an operator would enter a job number. I want to force them to use a
certain number/text format to insure continuity. Here is a sample of what
some of the job numbers could look like,
09-7654 P/1
10-9076 JD/2.3
09-3425 DS/10.2
10-2579 P/10.12

Thank you for the help. I already figured out how to make sure that caps get
used instead of lowercase.

--
John 3:16 "For God so loved the world that He gave His only begotten Son, so
that whoever believes in Him shall not perish, but have eternal life"

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