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

rankdir doesn't work directly in the subgraph, but if you add another set of curly braces - whatever that's called - rankdir works:

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

    subgraph step2detail {
        {
            "Step2" -> "note1";
            "Step2" -> "note2";
            "Step2" -> "note3";
            "Step2" -> "note4";
            rankdir=TB
            rank=same
        }
   }
}