I am working in a certain matter that has led me to write a long notebook. While doing this a I have started to work in some sections that require theory or keeping visual code developed in some other places. To help with this some applications provide the possibility of dividing the working area vertically or horizontally.Is there a way to do this with notebooks?

Closing and opening groups and subgroups cell may not be enough to achieve this visualization. I will appreciate any comment.

Regards

Jesus Rico