Stop wasting time and money with spreadsheets and generic estimating programs. They are sold to everyone for every thing and never do what you want.
You want to bid CONCRETE!
Estimating concrete foundations used to be trusted only to long term experienced estimators and contractors. Now you could bid concrete projects in a fraction of the time and you can do it accurately even if you never poured a drop of concrete. All you need is the basic square feet of slabs and lineal feet of footings and most of the rest is automatic.