composite vat calculation

Hi friends,

i have a one requirement we are using one line item for vat calculation and second line item for service tax calculation in sales order suppose 100Rs material price and 20Rs labor cost now we are using

VAT calculation 5% on Material amount 100Rs

Service tax 10.3% on labor amount 20Rs

But my client want

1. VAT 5% composite on 120Rs

Service Tax 10.3% on 20Rs

and

2. VAT 5% on 100Rs

Service Tax 4.12% composite on 120Rs

Both cases are there, please guide me how to do it

My pricing procedure

ZTRF Base price

VAT VAT% On Base Price

CST CST% on Base Price

SER Service Tax % on Base Price

ECSS Ecess% On service Tax

HECS HECess% On Service Tax

please guide me is there any changes in pricing procedure

Thanks

Seshu