GraphViz - How to have a subgraph be left-to-right when main graph is top-to-bottom?

Question

I have a graph file like this:

digraph {
    \"Step1\" -> \"Step2\" -> \"Step3\";

    subgraph step2detail {
        \"Step2\" -> \"note1\";
        \"         


        

Answer 1

By grouping the Step nodes into a clustered subgraph, the output is as follows:

digraph {
    subgraph cluster_0 {
        color=invis;
        "Step1" -> "Step2" -> "Step3";
    }

    subgraph cluster_1 {
        color=invis;
        "Step2" -> "note4";
        "Step2" -> "note3";
        "Step2" -> "note2";
        "Step2" -> "note1";
   }
}

color=invis removes the border that would otherwise be drawn around the cluster