The report shows interesting sums (number, topical value...), grouped by categories. With a click on the triangle the next level will be shown (or suppressed). For every element, the sums are calculated again. In this way all category levels can be shown and suppressed.
In addition to this classification, a period can be entered. With this, models of a special time period (purchase date) can be selected. You can enter the begin date, end date or both. If you enter at least one of these values, only models, which fulfill the criteria, are used for calculation. Models with no purchase date are not included if at least one date is entered in this dialog.
With the two Buttons ("+", "-") on the lower left side of the dialog, the whole list can be shown or suppressed. If you press the Button with the plus sign all categories will be shown. This may take a long time. Additionally to the standard functions, you can use the Button "Close" to close this window.