Raise POs straight off the BOQ, cost centre by cost centre. Ordered lines are locked and tracked against the estimate — so you always know what is spoken for.

No separate ordering spreadsheet. Select the lines, pick the supplier, raise the order — quantities and prices come from the BOQ you already priced.
Once a line is on an order it is marked and tracked in the BOQ. Committed cost per job and per cost centre is a number you can read, not reconstruct.
Record what actually arrived, keep backorders visible, and match supplier invoices against the order when they land.
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