AE expressions-separate channels

[agbarrows]

Hi there! I'm new here, I ama an animator/illustrator, i'm working on AE now creating little children-targeted animations for the Italian National Channel, RAI.
I have just a question (for the moment) when i use the expressions between two layers (ex. position) could I attach just one parameter of that?
I have the layer RED which moves up and down and translates right to left, i want that layer BLUE moves upa and down following the RED one but i want to be free to animate the blue X translation...
I hope it's clear.. sorry for my english...it's a little rusty...

[BaryonicMatter]

The x component of a layer's Position property is accessed with "position[0]" and the y component is accessed with "position[1]".

So for example the Blue layers position expression would look something like this:

[position[0], thisComp.layer("Red Layer").position[1]]

[agbarrows]

thanks....i tried and it works great!