Label Based Resources
Label Based Resources allow the Resource that is required at an Activity to be determined according to a Label Value.
In the Resource section of an Activity, check the 'Select resource by label' check box and select the Label to be used.
The chosen Label's value must then be positive integers from 1 (i.e. a Label with value '2' will cause the work to require the second resource in the 'Resources Required' list above)