I know only not easy ways. I think easy way not exist.
Firs method. Create module with tabs but....
Second method. U need free module to edit Back office menu.
Free module here *** Hidden text: cannot be quoted. ***
You need to create controller in module that being redirect to module configurations.
That controller use in Backoffice menu editor.
Example of controller.
U have module with folder name "
mymodule"
add in folder
/mymodule/controllers/admin/
file
adminmymodule.php
add code
This Admin
modulenameController use in Backoffice menu editor.
I try without controller put direct link like /index.php?controller=AdminModules&configure=
mymodule
but unfortunately, because required use &token= in link, that you can not generate from static link.
Be careful Backoffice menu editor easy to broke you Backoffice, will make backup for experiments.
Have good day.
P.S. Add your item to submenu. Because for parent menu you need controller too