You need to use GUIDE-LINES.
(1) Guide-Line is the % of each concrete phase (forms, steel, concrete, scafold, etc).
If you have in your hands a similar budget, found the percents % of each phase.
(2) You need to stand a REAL underground concrete Unit Price UP$ today used. See magazines tables (your region).
(3) Your total concrete volume TCV guive you the Total Price: TP = TCV x UP$ = TC (TC means Total Cost).
(4) Use then each percent % and you obtain the Price of each Phase. Imagine you adopt 20% of steel reinforcement, then: Steel Cost = 0.20 x TC is the steel reinforcement cost.
(5) You Work only with COSTS then you need to include the General Expenses Cost GEC (indirect Costs, Tax, etc).
By, by
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