Hi Arnima,
The proposal is to create a screen in SAP & create an I-view on the same.
This screen will have the option to fill in the details of the claim creation & in the back end do the validations of the data while input & this inturn calls the function modules to create a notification & sales order with the reference sales order.
BAPI_ISUSMNOTIF_CREATEMULTIPLE- using this BAPI you can create a notification & create the sales order of the parts to be paid to the dealers & create the billing document of the same using the SD route.
To best understand my approach try creating a notification in IW51 transaction & then use the menu bar to create sales order against the same.
The task is mainly to develop a custom screen development to call this standard objects & create screen validations / back end validations during save function.
Regards,
Sachin Balmiki