I'm using tasks to track individual contracts/jobs in a larger project. For each contract/job, I may have between one and several payments.

I would like to be able to quickly update the task when a payment is received, but I would like to track all of these values in a single field. So, in my case, the list field would be a series of values like [4000,2000,150,900]

Ideally, a function would be able to sum all values in the field so that I can use the value to calculate the remaining balance and display it in the various views.