ok heres my problem

i have a sheet working out my wages (only an est.) but it does most of the
math for me ie tax payment, total with over time without deductions etc BUT i
want the over time cell to work out my overtime rate ONLY if the total hour
sheet and the total hour cell minues lunch break cell read 40+ is this
possable or am i asking to much off the spred sheet? (this saves data input
in the long run)