Custom field incremental values

[joeyk]

I would also loved to see this feature.

Custom field type "Number (Increment)" to sum up field value (i.e dollars spent)

Description : If a user submits a form that has a field called, let’s say “Amount”, and then, later, submits the same form again, it would be really useful for marketing purpose, or as lead handover to sales, to be able to know the cumulative value passed in the field “Amount”. Example: We can imagine a custom field whose type is “Number (Increment)” (in complement of "Number) Let’s consider the custom field of type “Number (Increment)” named “Cumulative amount payed”. If the first form su…