Is there any way to use cross lookup tables in document types?

For example...

There is a job opening document type. Say each job opening needs to be categorized by departments. It would be easiest to have a Departments table that I could draw the ID from to populate a new job opening.

Is there a way to accomplish this without having to write a custom web part? Can I point a field in the job opening table to an ID in another table from within the Kentico Site Manager?

I can do it as a custom web part, that's easy. But it would be amazingly useful if document types already handled this somehow.

-Matt