Displaying and Deleting Totals 
Use
You can display totals only for (one or more):
If you total on incompatible units, such as quantities in kilograms and liters, a total appears for each unit. In the example below, the system has totaled the column Price:

Procedure
Displaying Totals
Select the desired columns, and choose
.
Or, right-click the selected column. From the context menu, choose Total.

The system can only calculate totals for columns containing values or quantities.
For every total created, a small solid box symbol appears in the totals field, and a small Total symbol appears in the relevant column heading, as in this example: 
Deleting Totals
Select the desired columns, and choose
again.
Or, right-click the selected column. From the context menu, choose Total.

Depending on the list, you can also display the subtotals above the totaled rows.