You could add a negative volume. I think that’s the best way, currently.
Be aware that we can’t (currently) undo a negative volume addition, so it’s best to get it right first time
I don’t think these volume changes are considered as losses, so that’s something to watch out for.
Hi Bernie, Thanks for reaching out! It sounds like you are looking for a way to reduce the vessel volume to account for the removal of hops/yeast sat at the bottom of the fermenter; if so, I would agree with @jon-kyme2’s suggestion. If I have misunderstood this, then let me know. Cheers!