How do I connect a Seat GUI to another object?

Incredibly confused.

What I've currently done is made a GUI which is given to the player when they sit in the seat. The GUI hierachy is:

ScreenGUI > TextButton

When the player clicks on the text button, I want it so that they can control, for example, another part's transparency.

Model > Seat > ScreenGUI > TextButton

Model > Part > Transparency

How do I get it so that when they press the text button, it goes up to Model then back down into Part ?

Sorry about it being confusing, don't think there's a simpler way to explain it. Help appreciated!

• Sam4550

Just like this:

I am assuming the script is in seat

script.Parent.Part.Transparency = stuff