@Sikander_Dhaliwal sorry to hijack your topic in some way. I am trying to get a little more attention to a funding campaign some community members are trying to get off the ground which aims at adding a sub/parent-warehouse feature to ERPNext.
As you are currently dealing with warehouse functionality you will benefit from such a feature greatly I am convinced. Please feel free to check the related topic and add some funds on this from your side here. Minimum contribution is as low as $15
Or maybe you are a talented developer and want to code this