Exclude fields from update on edit

Exclude fields from update on edit

Really could with some help if anyone knows the answer to this :)

On Form A I have the following bit of code in the "On edit > On Success" which updates Form B when Form A is edited:

  2. for each item in input.Products
  3. {
  4.     inv  =  Product_Inventory  [ID == item.Product_Name];
  5.     inv.Available_stock = (inv.Available_stock  +  item.Quantity);
  6. }
However I have 2 fields that I need to be editable on Form A that do not update Form B when being edited.

Does anyone know how I can keep the above code in On Edit but it does not update if certain fields are edited?

I guess it needs an If statement in there but I don't know how to write it.

Please help! :)