In the Outlook window, click on New Items -> More Items -> Outlook Data File.
Select a location to save the new blank PST and provide a name for it.
Click on OK.

Regards,
Peter

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If you're looking for a solution to merge several PST files, the Aryson PST Merge Tool is an excellent choice. This tool is dependable, efficient, and secure, ensuring your data is safe while getting the job done. You may merge numerous MS Outlook personal folder data files (.pst) into a single PST file with the PST Merge Software. This program combines all mailbox objects, including emails, contacts, calendars, tasks, and more, into one PST file. Additionally, this free PST Merge Tool enables merging PST files into one without sacrificing data for Outlook PST files from all versions of MS Outlook.