All item groups are displayed to the right of the main window. Only the requirement items, suppliers and existing purchases with items of the selected group(s) are displayed in the Summary. When opened for the first time, no item group is selected.

1. To display all item groups, click on the top empty line in the  item window.
2. Mark  an item group or subgroup in the list with a left click or Shift/Ctrl key and left click for multiple selection.
3. In the main window, only the requirement items that have this item group(s) are displayed.
4. Only the purchases that contain items in this item group(s) are displayed in the existing purchases window.
5. In the list of suppliers, only those suppliers are displayed who have items of this item group(s) in their range.