How to add Custom Board in west workspace

Hello!
I am using nRF Connect SDK 2.6.0v.

I created a west workspace and i want to make custom board.

I took reference from Devacademy nRF Connect SDK Intermediate Lesson3/exercise1.

In Devacademy example it is not showing for west workspace.


While building Kconfig file is accessing from from installation path.

Please suggest some inputs 

Thank you in advance

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