Move a lot of prices at once — by an amount, by a percentage, or against what competitors charge.
A marketplace price replaces the catalogue one there and nowhere else.
Negative lowers. −10 takes a tenth off.
Anything that would go under is refused and listed. Products with no cost price on file are refused too, rather than quietly skipped.
The thing that catches a percentage typed with the decimal in the wrong place.
Reading your plan…