Ok i am back and I am in need of help again

As you all know I have been working on a wage pay spread sheet for working
all around the us
so far you all have helped out bunch
well let get to it I need help with something like a check box formular
well what I want to do is have a box that will let me make a check mark in
it or something this check mark will be important what I want it to do is if
it is checked I want another cell to add a set of cells timesed by a number
in another cell but if the check mark is not in the box it will subtract
from the gross amount of my wages is this possible