...
In the Comment column, you can enter some additional information about an item.
You can specify the Discount for the inventory or service item The Discount,% and Discount columns are available if the Enable discounts and markups in sales documents option is selected on the Administration > Settings > Sales form. Use these columns to specify the manual discount granted to the customer. The default discount can be set in the customer contract.
The Auto-Discount % and Auto-Discount columns are available if the Enable Automatic Discounts and Markups option is selected on the Administration > Settings > Sales form. Non-zero values in these columns indicate that one or more discounts are applied because their conditions are met in the document. If you changes any line in the document, click the Auto button to recalculate the automatic discounts. For more information on discounts, refer to Overview of Trade Discounts.
The Set Components button on the table toolbar is available if the Enable Sales of Sets option is selected on the Administration > Settings > Purchasing and Warehouses form). This button is active only for items of the Set type (for details, see Items.) For each item which is a set, you can select the Specification. To view a list of the set components, click the Set Components button on the toolbar - this opens the Set Components dialog box (below in the topic).
...