Yes, you can merge DBX files by using the DBX Merge tool.
In this option when we join two DBX files, it saves the files separately in the new DBX file such as inbox1.dbx and inbox2.dbx will be the two folders if we join two DBX files.
Merge Option helps you to merge two or more files into one file. It creates a common folder and save all email files into their respective folder.
Yes, you can save the merged DBX file anywhere and in any folder.