Can anyone tell me the step by step process to connect reachy simulation on unity
Hi @Riya !
Here’s a link to a step-by-step article on how to run the simulation on Unity : Controlling a Reachy robot in Unity | by Gaelle Lannuzel | pollen-robotics (medium.com).
Don’t hesitate to share your projects with us once they’re up and running. 
Best,
Annaëlle