Consumed Quantity should appeared in Service Entry Sheet

Dear Experts,

There is a requirement for Consumed Quantity of Services should reflect while creating Service Entry Sheet. For Example If PO has Service Master XXXX for Quantity 100 against 2 SES were booked with 70 quantities. So when i create a new SES, Consumed quantity of services ie 70 should reflect in column. Is there any functionality exist for this in standard?? or can this be achieved with enhancement?? PLz guide..

Regards,

rohit