Clarification required on sec 194 i for generator exp

Generally T.D.S is to be deducted on Gross amount charged on Bill. When two bills are raised seperately i.e one for Service charge and another for Reimbursement of expenses,T.D.S is to be deducted on Service charge only. When a single bill is made for both reimbursement of expenses and service charge, deduct T.D.S on entire bill amount excluding service tax levied.