It would be a good idea to be able to place percentage tranches according to the volume and price of labor.
example:
from $ 5 to $ 10 = 7%
from $ 11 to $ 25 = 6%
from $ 26 to $ 100 = 5%
and above $ 100 a fixed price or very low% for large volumes
all of this in the administration by having the possibility to create ourselves palettes and having the possibility to put it either in% or fixed price for each step.
regards
