There are a couple of ways to apply a discount to an exhibitor invoice. You may manually discount an item or you may apply a predefined discount.
Click Dashboard
Click the Exhibitor module
Click the Manage button
Locate the invoice you wish to add an item to by using the Search field and searching for the company, once located, click on the row to open the invoice
From the horizontal menu, click Registration, select Discount Items
Click the Edit button beside the item you want to apply a discount to
On the Discount screen, you may choose to apply a manual dollar amount discount by completing the top portion of the screen under Manual Discount and entering a dollar value and a note, then clicking Assign Manual Discount button
To apply a pre-defined discount to an item, complete the bottom half of the Discount screen under Assign Discount by clicking in the Discount Name dropdown field and selecting one of the predefined discounts, then click Assign Discount
Click Admin in the horizontal menu and select Overview to review the Invoice