Not basic Mirroring option

Hi All,
I found a model that really interests me.
I’m trying on the basis of this model find new features and options of Sketchup.
This is Telehandler model, And is creating with some kind of mirror tool. If I want to change right side of model, left side is changing automatically. Could you please let me know what is this , how you call for this option, and where I can find it as a tutorial?
I am sorry I am fresh with Sketchup and if this is stupid what I am asking please let me know. I will really appreciate for any help you can provide.

It would simply be a mirrored component.
All edits to a component are reflected in other copies of that component, it doesn’t matter if the component is mirrored or flipped, it will show all edits.