Managing wounds automatically - repeating fields ?

Hello, i try to find a way to automate wounds management on my Pendragon character sheet. the basic formula is : curent Heal Points = max HP - wound1 - wound2 -wound3 ... Obviously i think to use repeating fields, by creating a new item for each wound, but it seems it's not possible even to know how much items are in the repeating field ? I have to register individually each wound, because each can be cured with first aid. I would like at least a button which calculate the current hit point by adding each wound current value with the max HP. Is it possible to do this ?

Unfortunately it's not possible to sum fields from repeating sections. However, you could create a single field that you manually update with the total of all the wounds that you could then plug that one field into the formula. That's what I had to do for Encumbrance on my Savage Worlds character sheet. It's a bit kluge, but better than nothing. By creating a single field in this manner, you could also tie it to the toke via one of the bars, making it easy to update as well.

Well, so i think i will instead put 10 fixed wound input numbers., with 0 default value. I think there will never be more than 10 wounds, otherwise i will manage it as a special case.