I am writing my own module right now.
I have seen that If i want to overwrite the original “page-menu” on the left side, i have to do it in the config folder f.e. like in apps/erpnext/erpnext/config/selling.py
I only want to add one additional Menu-Link.
Do I have to overwrite everything like in selling.py ?
and when yes, is it possible to read out or export the original already generated Menu-List ?