FM for Creating a Parts Sales Order from a Servie Order (IW31)

Hi experts,

I am working on ECC 6.0. My req is to create part sales order for a servie order in txn code IW32.

When i open a service order with tcode IW32, in the components tab, i can enter all the parts. After that I select the complete component tab parts or any one, and click the Truck button at the botton(advanced shipment), a part sales order will be created.

I am doing this in the portal. So i need the Function modules used to create and change the Part Sales order from a service order.

Kindly tel me the FUnciton modules names to create a sales order from a service order, if anyone has done this before.

thanks in advance,

Ntk