count calcula

[dana180]

to simplify myself i explain on greatoutdoor company found in cognos connection.
i need in a crosstab report to count staff name in every territory(threre are 7 i think).
i can't make a count on dimention member.only on a measure.
but i have no suitable measure.
do i have to drag any measure to report columns or measure area
before i create a calculation data item? what property data item has to have?

any help will be appreciate since i am new to topic