Bonus scores are most often used for an improvisation score for jazz band auditions. A bonus score earned by an entry will be directly added to that entries final score. When you create a bonus score, you will also specify to which auditions that bonus score should apply. When a student earns a bonus score for one entry, that bonus will be applied to all entries that receive that bonus score.
Let's say you create a bonus score called, "Saxophone Improvisation," and assign Jazz Alto, Jazz Tenor, and Jazz Bari auditions to that bonus score. If a student is entered on all three saxes, when they receive an improv score on one sax, that score will apply to all 3. The system will not allow another improv score to be assigned by the same judge unless the first one is deleted. If you want that student to improv on each instrument separately, you will need to create a separate bonus score for each instrument.
The weight allows you to control how much influence the bonus score has on the outcome of the audition. The bonus score is multiplied by the weight then added to the final score. The weight may be any positive number, including decimals.