thisComp.layer(“LayerName”).transform.position*(-1)
basically use the pick whip but multiply it by negative 1.
then add or subract a number to get the correct offset relative to your layer.
thisComp.layer(“LayerName”).transform.position*(-1)+720
This way isn’t perfect because it depends where your layers start you could also add nulls to offset layer by parenting them.
Andrew
I’m sure there is a better way but…