You can perform numeric calculations and percentage-based calculations in the Component Editor and Attribute Spread Sheet in multiple cells at once.
To perform a calculation
All selected cells get a new value specified by the operation.
To add a value to selected cells
The selected cells increase by 4.0.
To subtract a percentage from selected cells
The selected cells decrease by half their current value.
Some values are subject to limitations and may not change to the desired value because they are bounded by other factors.