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The manual method is not straightforward; it is a two-step process.

Step 1: Create a New Outlook PST File
Open Outlook,
Click on Home tab, click New Items, click More Items > Outlook Data File.
Click on Home tab
Browse for the path to save the file, give it a name, and click Ok.
A new Outlook PST file is now created.

Step 2: Import Outlook Data to New PST file
In this step, the data from existing PST data files will be transferred to the new file created in Step 1.

Open Outlook, and click on the File tab.
Click on Open & Export > Import/Export.
Click on Open & Export 
Select Import from another program or file; click Next.
Select Import
Select Outlook Data file (.pst) and click Next.
Select Outlook Data file 
Browse the PST data file to import and click Next.
Browse the PST data
Note: Select between the options given in this step as per the need (shown in the screenshot above).

Select the folder(s) you wish to import to the new PST data file.
Note: Do not forget to add a checkmark on sub-folder(s) in case of partial selection of folder(s).
Click Finish.
Importing from old Outlook PST data file is successful, but Step 2 has to be repeated to complete the migration from multiple PST data files. Above, the data is imported from a single file only, though the iterative count of Step 2 would depend on the number of PST data files you have from which you wish to import data into a single Outlook PST file. This makes this process of merging multiple PST files a hectic and long procedure that can get fail due to human errors. An ample amount of time is needed to complete this merging successfully.

Using third-party software for the merging process, which can automatically combine any number of PST files into one PST with a single click, easily merging multiple PST files into one PST file. The ToolsBaer Merge PST Tool provides Microsoft Outlook all versions of which are supported in 2003, 2007, 2010, 2013, 2016, and 2019. Merging ANSI and Unicode PST will result in a Unicode PST and supports Outlook PST files with password protection. 
This software can create one PST file by combining PST files of any size and without any errors & without any data loss. It has some incredibly helpful features that let you connect or mix different kinds of data, such as emails, contacts, notes, calendars, tasks, and journals.

1. Select your Home tab, then New Email > More Items > Outlook Data File. Give your blank data file a name and save it.
2. Now, head to File > Open & Export > Import/Export > Import from another program or file.
3. On the next screen, select Outlook Data File (.pst).
4. Browse to the PST file you want to import. You now have the option to replace duplicate files, allow the creation of duplicates, or refuse the import of duplicate files. For simplicity, choose Do not import duplicates.
5. Once the import is completed, you can start the process again to import as many PST files as you want into a single new PST file. 

Regards,
Peter

PST Merge Tool is a unique & professional tool to combine unlimited PST files into a single PST file. This well-programmed application allows users to remove duplicate items while merging two or more PST files. The software is compatible to combine both ANSI and Unicode PST files into a new PST file. Any technical or non-technical users can easily operate the software because it has an attractive and user-friendly GUI interface. Download the free demo version of the software.

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BetaVareMerge PST Tool stores all the messages and another important database in Outlook PST file format, and we can use these email files as per our needs. This software is supported by all Windows versions: 11, 10, 8.1, 8, 7, and Vista. If you have a large number of Outlook PST files and want to make them all readable at once, you can use merge software. Merge PST Tool software helps you to combine your multiple Outlook PST files into one Outlook PST file and use it without wasting significant time. Both professional and non-professional users can also use this tool to combine PST files. And it has the following properties like Attachments Notes Email Messages Contacts and Calendar.

The greatest option, called PST Merger, is what you should utilize if you're seeking for a hassle-free way to combine numerous PST files. Utilizing this technology is simple, and it removes any obstacles from the procedure. No matter what Windows version a user has, they may install this program. PST files may be joined without users having to download another application. The size, folder, and year of the user's PST files can be combined into a single PST file. File sizes are not constrained. Users may use this utility to combine PST files in both professional and non-professional settings. To learn more about this software's features and capabilities without spending anything, use the free demo version.

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As you know, Outlook creates a single PST file for one system, but sometimes users need to move different PSTs into one; for this, users need to merge PST files in Outlook email client. Shoviv PST Merge Software allows users to combine two or more PST files in a single go. This software is compatible with merging both types of PST files: ANSI and Unicode. Also, users can merge the PST folders into new or existing ones. Additionally, this tool has a quick search option to find the required PST files quickly. This software supports all versions of Windows OS.

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There are the most useful methods for combining multiple PST files in Outlook 2019. To combine multiple PST files into a single PST file, utilize the SameTools Outlook PST Combine program, which is simple software that can merge multiple PST files into a single PST without affecting the original PST. Both Unicode and ANSI PST files are supported by the program. This amazing shareware makes combining PST files simple. The program validates the files and guarantees that the conversion process proceeds successfully. Using this software doesn't require any technical knowledge on your part. PST file merging is a simple process that only requires a few clicks to finish. and it is compatible with all Microsoft Outlook versions: 2019, 2016, 2010, 2007, and 2000.

You want to best way to combine multiple Outlook PST files. Users can quickly and simply combine multiple Outlook PST files into one PST without compromising their distinctive structure by using the Mailvita Merge PST Tool Mac. Where to save the created Outlook PST file is up to the user. You can combine many MS Outlook personal folder data files into a single Outlook PST file by using this tool. Without downloading Microsoft Outlook, combine Outlook PST files to discover more about the features and capabilities of the application. It supports all Mac and Windows OS versions.

Thanks for solution

Thanks for solution

Nice information