By default, if you register somebody in two divisions for a match, each of his scores will be treated equally.  (We did that with Sam in the tutorial.)

However, if you prefer to have someone's 'first' registration be the only one that counts for place, you can check Show second gun check box in Program Preferences.

Then if you mark Reentry (second gun), this registration will be treated as a reentry.  If you have marked Reentries don't place in Program Preferences, any registrations for which you tick this box will have their scores shown at the bottom of their classifications.