Can you branch from a sub-branch in Github?

I have a repository with my “main” – branch. Which I do not wish to touch, I have there for sat up another branch called “dev”, which will work as a ready place before the code is pushed to the “main”.

However I can not seam to figure out how to do this or if this it even possible with GitHub.
Could somebody enlighten me?

I have tried to use Github, but only able to create branches from the “main”.
If possible I would like to do it through the visual interface.