This answer is incomplete. As this Guide clearly explains, there are three types of expense claim payers.
@AnnaL, your questions indicate you are probably new to accounting. You should spend some time reading the Guides before trying to use the program for your real accounting. Create a test company and try things out. Otherwise, you are very likely to create problem you cannot undo. Then you will have to start over.
Also, the Guide @sharpdrivetek linked to about proprietorships has nothing to do with expense claims.