This tab shows the calculated cost per unit for each category of the selected spreadsheet row based on the values in the Extension tab. For an item, it also includes the material class, BOM description, and job cost information. Initially, the information comes from the item and bill of materials in the standard database. Any changes you make apply only to the current estimate.
The fields correspond to the following spreadsheet columns.
Tip: Click 
to choose from a list of material classes or BOM descriptions.