Can we settle the service order to the service contract.

Normally we settle the service order ot the sales order, can the pricing conditions and the pricing agreements are copied into the sales order. But my doudt is whether is it possible to the settle the service order to a service contract, i think it is notpossible kindly let me know the procedure if it....

If there is no sales order with respect to the service order, then how billing will be performed.