Hello,
I can help you because once I faced this same situation to split PST data files, that time I have used the Import & Export method t solve my problem. You can use the following steps to proceed with this:
Step 1: Run Outlook and make a new PST file.
Step 2: Select “File”–> “More items”–> “Outlook Data File”.
Step 3: Search storage location and provide name to the new file then click “OK”.
Step 4: Select the options “File”–> “Open”–> “Import”–> “Export”.
Step 5: choose “Outlook Data File” the click “Next” and select the folder to export from.
Step 6: Click “Browse” to select the file and hit “OK” from the Open Outlook Data Files window.
Step 7: Finally click on “Finish” then the process will get started.
Thanks & Regards
Dexter Morgan