BAPI to upload service line to Quotation

Hi,

I'm using BAPI_QUOTATION_CREATEBOS for uploading Service lines into BOS

Qoutaion. We are able to upload single level service lines successfully

using the above BAPI. We are facing lot of difficulty on building up

multiple level upload through interface using the above BAPI. Can you

please help us in finding out the interface which can upload multiple

levels using the bapi or if there is any standard interface which can

be used for the same. Thanks in advance.

Regards,

Venu