Use the Sum feature to calculate properties that are not automatically summed in the Data Table.
What Properties are Automatically Summed?
Any properties that are of a specific unit of measure are automatically summed in the Data Table. You can not turn off these auto-calculations.
A length property
A volume property
An area property
A weight property
An angle property
How to Know What is Being Summed
The easiest way to tell what properties are being automatically calculated is by looking at what is being shown in the column's Total cell or by look for the Sum icon in the column header.