Need a little help to achieve fields calculation (maybe with Hooks?).
I need to take 2 or more fields, do some math and write the result to another data collection field (like excel sheet, field1 - field 3 = 5 than write the answer to field6.
Is there any way to do this with hooks?.
What is the trigger for the hook? I need it to do the calculation at any time that some field is changing.
Thanks a lot.