Meter reading estimation using EL60/EL61 and EL28

Hi ,

Currently we are having DPC enabled rate categories with Dyn.per.control value as "ESTE" (Estimation of Meter Readings in Billing) but now we have a requirement to use estimation functionality of "EL28" for certain groups of customers within the same rate category . So my question is can we use this rate category to bill the customers using either EL60 or EL28 depending on the group , If not what is the possible solution .

Thanks

Manoj