Work item
(See Measurements in image files/Types and methods of measurement/Object count )
When linking the measurement with WBS work items, the formulas which were set in the region ‘Predefined measurement calculations’ of the ‘Custom Measurement window’ in the Library are also shown.
Enter for each of the WBS work items -to which the measurement will be linked- the formula you want.
Alternatively, when the cursor is at the formula field of the WBS item, you can automatically copy one of the predefined formulas by double-clicking on it.