axis x with maximum static and 3 numeric expressions

[#1]

I have a linear graphic.

I have 3 numeric expressions: y1, y2, y3.

I have dates on asse x.

I put the x-axis the maximum static: Date (Max (DATE) -60). I need the maximum static: Date (Max (DATE) -60) applies only to y1, while y1 and y2 must assume all values ​​of x.

Please, how can I do it, on the same graphic?

Thanks,

L.