Isn’t it simple like:
Posting an example:
Would be grateful for the support on this, thank you in advance!
Hi Maxim,
Your flow could look something like this:
(Right click and save image as to see whole flow)
If you're getting errors, this is possibly because one of the 2 attributes is empty. So add some empty checks in or before your change action that if one or both are empty, your currentstock will be 0 or stay the same.