I am not sure if i understood you query correctly…
But If you are looking to add content part to a document,use this service and this needs the existing bizdoc from the pipeline…If it’s not in the pipeline use wm.tn.doc:view to retrieve the bizdoc using the document’s InternalID.
wm.tn.doc:addContentPart (Adds a new content part to a document.)
HTH,
RMG
#webMethods#B2B-Integration#Integration-Server-and-ESB