The idea is not new, but now finds a professional implementation:
QuickCalc works with elements in which service book items are stored by factors. Masses are therefore only to be determined element-related and QuickCalc genieriert from the specification with the appropriate positions. Subsequent changes to the quantity of an item will automatically revaluate all affected items – without their intervention! This results in enormous synergy effects, which lead to considerable time savings when creating bills of quantities. The acquisition costs pay for themselves quickly.
QuickCalc ships with over 700 pre-built items and 6000 precalculated items. With this trunk a start into your first project is made easy, all data are changeable and can be adapted easily.