How to add sub folders in outlook app

- How to add folders in outlook app
- How to add subfolders in outlook app on iphone
- How to add folders in outlook app on iphone
- How to add folders in outlook app on ipad
- How to add new folders in outlook app
- How to add folders in outlook mobile app
- How to add folders in outlook android app
- How to add public folders in outlook web app
- How to add calendar in outlook
- How to add account to outlook
- How to add outlook to gmail