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

Here's as simple as it gets - just use the group attribute to have graphviz prefer straight edges:

digraph {
    node[group=a, fontname="Arial", fontsize=14];
    "Step1" -> "Step2" -> "Step3";

    node[group=""];
    "Step2" -> "note1";
    "Step2" -> "note2";
    "Step2" -> "note3";
    "Step2" -> "note4";
}