handle Multiple document of single Batch of WFR

Hello Experts,

In a single batch of WFR, if we are having multiple documents(ex: 3-5 document in a single batch of WFR) then after extracting the information from the document during the export will generate the separate xml file for each document and in txt file it will have the information of all the supporting xml file information under supporting tag.

but when we are saving the  document in UCM12c using the import option it will save the each document separately then during the pulling of data from UCM how will come to know which document belongs to which batch and how will process it for further processing of payment.