Indirect only Render Layer?

Been practising Render Layers and while I’ve managed to separate a background including indirect lighting on one layer and a character on another, I’m wondering how I can separate the indirect lighting onto its own layer?

Just to clarify a bit … the main aim is to have a Background layer that I would only need to render once then the Character and another layer being the Shadows to project onto the Background while maintaining all Indirect affects. This new Layers system is great but it’s still a little confusing.

EXR multi layer as render output. Before select the pass you will need like indirect lighting and then in compositing, you manipulate the passes with filter or else