Introduction: Hi, my name is CC_Playz but you can call me CC
I have been a builder for more than a year now but I cannot seem to find anything on Roblox Studio that is able to help me with the problem I’m currently having.
The title may be a bit confusing but I’ll try to explain it a bit further.
Explanation: Okay so I have a model comprised of alot of parts. I would like to select only parts that have a specific color and texture(eg. red, neon) and change them to a different color(I would prefer to do this as I need to change them as fast as I can in order to meet a deadline asked by a client.)
Problem: The problem is, the mesh has so many parts that comprise of those same colors, all so small and seperate from eachother, it is almost impossible to select them one by one.(I have grouped and organised the parts in the mesh but some of the parts are un-named and I don’t know if they comprise of some parts I need to change as well),(I also know that I can use alt click to select them one by one) But because of the size of the mesh and multiple parts grouped to grouped parts within the mesh it is almost impossible to change them all with alt click.
Can anyone help me?
If there is even a plugin that allows me to do this can someone inform me of it? 
Thanks.