How to use a variable in reference path?

Hey guys, I have a part name stored in a variable, it changes regularly, being in a for loop. As I said, it's a part and I need to use the path to it, but as it changes, I can't enter/concencate/insert the variable/part name in there.

This is what I'm aiming for:

partName = "part28"
local part = game.Workspace.MyFolder.Model.--and here put the value of 'partName'

How would I achieve this?

Thanks in advance.

If Parts name changes you can do

partName = part.Name
local part = game.Workspace.MyFolder.Model:FindFirstChild(partName)