OBI Reporting tool - how to combine multiple rows transaction user comments related to each requisit

Summary

Is there a way to consolidate a Transaction User comments in one row?

Content

Hi - how to combine multiple rows transaction user comments related to each requisitions in one row using OBI tool (the subject area that I am using for pulling this information is (Requisition Tracking History> Transaction User Comments)? currently my report is pulling multiple row and that is not what I want - I need to to consolidate all the Transaction User comments in one row to avoid multiple rows for one requisition..

Thanks,
Shobha