Hi, if anyone could help me out on this - many thanks in advance!

I'm trying to find out if someone has already developed this custom item. It sounds simple enough but I don't have any programming experience.

I have 1 item with 5 labels. I want the respondent to rate their preference for each of these labels using a number from 0-100, but i'd like the total for each of label preference to add to 100, like so:

A: 25
B: 30
C: 0
D: 0
E: 45
Total = 100
The total has to add to 100 in order to go to the next item. Does anybody know of someone who has done this and would like to share?

If I'm not making sense, I can reclarify.