I have cells

G2
G4
G13
G14

when I change the value in any of these I would like it to change in all 4
ex. If I change G2 to 65 then G4,G13,G14 will be 65
If I change G4, then the rest will change. and so on. I only need these 4
to be the same.

I was going to do the =G2, but I can't do that. I don't know which cell
they are going to change. They are using this for a cost presentation. I am
leting people use this that have no clue about formulas and will get
frustrated, if it does not work.
Thanks.