Pre-calculations are used to see planned costs, throughput times, and lead times, based on data from BOM and routing, parts, and work centers.

Post-calculations are used to calculate and compare reported costs per manufacturing order, project, or part, with the planned costs.

You can read more about pre-calculations and post-calculations here.

If you want prices to be saved, they need to be entered under the Selection tab under Saving.

Save prices in Pre-calculation.