Item of the type Packages typically contain more than one item. When you enter a package as a line item it will appear as a package on the invoice. As the package is being entered on the invoice, it will display a master input form for each item type making up the line item. In this form you can enter or select the pertinent information related to the item. Example for lens, the prescription for the right and left lens. ( see Packages in Inventory for more detail), for a pair of glasses you will be prompted for the frame, and the two lens.
The Package Invoice Line Item Screen will list in the Package Information tab the items that make up the package. You can edit these items by double clicking on the item listed. It will open up the line detail form for the selected item.