Logic Based Auto-Number

We have a request form that generates an auto-number for each request. We want to open up the request form to handle different types of requests that generate a unique Prefix based on which value they select in one of the fields. Has anyone successfully done this? Here's an example:

Form asks if you want to eat a Sandwich, Salad or Soup for lunch?

If "Sandwich" is selected, the request ID is SAND-001

If "Salad" is selected, the request ID is SALAD-002

If "Soup" is selected, the request ID is SOUP-003

We are trying to avoid having multiple request forms for the same type of request but need a way to differentiate the IDs. Open to suggestions!


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