Control ChartField
A control ChartField is a key ChartField that you designate to be the control field. Designating
a ChartField as the control allows you to set attributes for a specific value of the ChartField
that are different from the attributes specified for the budget type in general. For example, if
the tolerance for a Projects budget type is set to 10% in general, you can override this value,
making it higher or lower for specific projects.
