How to create the same folder as backend in advanced version?

Question

Yii

Good afternoon, it became necessary to create 3 admin panels for different types of users (they have different functionality), I think the following option suits me:
fronend - the external part of the site
profile - a panel for the user
designer - a panel for the designer
admin - a panel for the administrator (director)
well and to the pluses - you can not particularly delve into the code if you suddenly need to add something.
the question is: how to correctly and correctly create such folders (mini applications) in yii2, which will be similar to the backend?
and question 2. how to feed all admins the same template (layout)?