...
The Discount,% and Discount columns are (or Discount Price) 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 discount that was used for the inventory or service items in the basis (original) document.
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. Use these columns to specify the auto-discounts that were applied to the returned items in the basis document.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 select the specification and 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).
In the GL Accounts column, you can view the default accounts to be updated by this transaction. If needed, you can replace them with other accounts.
...