You can easily do this with grouping. Right click an album and click edit. You're now on the tag editor. On the bottom is "Grouping". Put your code in there. Or if you wish for 2 or more people to have the same album filtered, you can put both codes in by separating them with a semicolon. Like this "JMJ; ERJ".
Now, after you have given your album a group, go to the "thumbnail browser". I'm not sure where it will be for you, but for me it's on the left panel at the bottom. If you can't find it then press the hamburger button in the top left corner of MusicBee and click Arrange Panels, and you can find it there to add to your configuration.
Once you have located the thumbnail browser, click the title of the heading (Not sure what it is by default. Maybe "Album"?) and then change that to Grouping.
That's it
This is the method I use in order to split up my library between Studio albums, EPs, Soundtracks etc. Hope it was helpful.