that's exactly what Clearwell (or DA) is for. create a new search, run the search, review the results, accept the results, add any tags to the items, export them to PST.
Andrew is correct. To do bulk exporting in this manner you need either Discovery Accelerator or the Clearwell eDiscovery Platform IC (Identification and Collection) Module
Is there anything else we can do to assist you on this matter?
If not can you mark a post as the solution so it can be closed and no longer listed as an open issue