Display State/Configurations Help

Hi,

I can use some help with either display states or configurations. I've never used them before and not sure which I use here/how.  Essentially what I have is a box which to simplify it can have 4 components.  In state 1 it will have components 1 and 2 as shown.  In state 2 - component 1 is removed, component 2 slides up into its place, and component 3/4 are added in on the right side.  Can someone give me a quick rundown on how I go about this?

Thanks

SolidworksAssemblies