How to do custom sidebar menu

How to add sidebar custom menu with coding. I am use v15. I am try my best but not working. What is the issue. Anyone please explain

@parthokar90

Help yourself with Feature: Role - Wise Custom Sidebar Creation with Custom or Dynamic Links in Sidebar Items

I am using v15 i am try to create one knput field

below supplier name input field. I am create custom app install the custom app update hooks.py with code and export fixer with bench command after that i check in python console its shows every thing. But the problem is ui not updated with my custom field i don’t know whats the issue.

do bench migrate in console