An assembly item is a group of items that you have assembled using the Bill of Materials tab of the Maintain Inventory Items window.
G/L Sales/Inc: Enter the default income account that will be credited when you sell assembly items.
G/L Invtry/Wage: Enter the default inventory account that will be debited when you purchase assembly items and credited when you sell assembly items.
G/L Cost Sales: Enter the default cost of sales account that will be debited when you sell assembly items.
Costing: Enter the costing method used for all assembly items. To ensure accurate costing, Sage 50 highly recommends that you stick to one costing method for all stock items and assembly items.