Individual capacties as workcenters

Dear Experts,

We have created a work center which collectively represents a group of 15 machines. Hence a work center with start and end time is created with 15 individual capacities like C1 , C2 etc . And start and end time and utilization will vary between the capacities. The issues is that at the work center level which groups this individual capacities not reflecting or cumulating the capacities of the individual capacities. Even in CM01 system is not dynamically cumulating or displaying the individual capacities. Please suggest how to proceed.