Can "department" be set inside a request, and not based on a user AD object property?

Can "department" be set inside a request, and not based on a user AD object property?

It would be easier for us to NOT have to manage users in AD, and force each request they enter to be associated with a particular department. Rather, it would be more beneficial if we were able to assign a new request to a particular department from a dropdown choice, so that a dept head can view all relevant requests based on the request content itself, and not based on who entered the request. Is this possible? 

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