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Open Microsoft Outlook:
Launch Microsoft Outlook on your computer.

Create a New PST File:
Go to "File" > "New" > "Outlook Data File."
Choose "Office Outlook Personal Folders File (.pst)" and click "OK."
Specify a location and name for the new PST file, set a password if desired, and click "OK."

Open the Existing PST Files:
In Outlook, go to "File" > "Open & Export" > "Open Outlook Data File."
Navigate to the location of the PST file you want to merge and select it.

Copy or Move Items to the New PST:
In the original PST file, select the folders or items you want to merge.
Drag and drop or use the "Move to Folder" option to move or copy items to the new PST file.

Repeat for Other PST Files:
Repeat the process for each additional PST file you want to merge.

Greetings,
Peter