I need help with making a paint selector menu!

I m very new to the unity engine and i dont know to use it very well , i have looked everywhere in google , youtube everywhere i cant seem to find a tutorial on how to add paint selector in the car showroom .
Would help me a lot if someone could help me <3

These are the Unreal Engine forums not the Unity forums and I am not sure what Car Showroom you are talking about. Thread is being locked.