Create a diagram links with little combination in shapes

Hi All. I’m newbie in GoJS. I want to create a diagram links with little combination in shape. There are rectangle rounded shape and circles shape. Is it possible to create it in one layout diagram? It will be good if anyone can help me to create in static data for a sample. For more details I attached a sample diagram picture that I want to create.

Thank you for advice.

Case closed.

In case anyone is interested in an example:

    myDiagram.nodeTemplate =
      $(go.Node, "Auto",
        { width: 150, height: 50, isShadowed: true, locationSpot: go.Spot.Center },
        new go.Binding("location", "loc", go.Point.parse).makeTwoWay(go.Point.stringify),
        $(go.Shape,
          { fill: "#eee", stroke: "gray", portId: "" }),
        $(go.TextBlock,
          new go.Binding("text"))
      );

    myDiagram.nodeTemplateMap.add("app",
      $(go.Node, "Spot",
        { locationSpot: go.Spot.Center },
        new go.Binding("location", "loc", go.Point.parse).makeTwoWay(go.Point.stringify),
        $(go.Shape, "Circle", { width: 70, height: 70, fill: "#ccc", stroke: "gray" }),
        $(go.TextBlock,
          new go.Binding("text"))
      ));

    myDiagram.linkTemplate =
      $(go.Link,
        {
          // routing: go.Link.Orthogonal, corner: 10,
          // curviness: 10, //curve: go.Link.Bezier,
          relinkableFrom: true, relinkableTo: true,
          reshapable: true, resegmentable: true
        },
        $(go.Shape, { stroke: "#aaa", strokeWidth: 1.5 }),
        $(go.Shape, { toArrow: "", fill: "#eee", stroke: "#aaa", scale: 1.5 },
          new go.Binding("toArrow"))
      );

    myDiagram.model = new go.GraphLinksModel(
      [
        { "key": 1, "text": "SALES", "loc": "0 100" },
        { "key": 2, "text": "INVENTORY", "loc": "400 0" },
        { "key": 3, "text": "BUDGET", "loc": "400 89" },
        { "key": 4, "text": "PRODUCTION", "loc": "327 157" },
        { "key": 11, "text": "APP1", "loc": "100 0", "category": "app" },
        { "key": 12, "text": "APP1", "loc": "230 0", "category": "app" },
        { "key": 13, "text": "APP3", "loc": "190 93", "category": "app" },
        { "key": 14, "text": "APP4", "loc": "92 187", "category": "app" }
      ],
      [
        { "from": 11, "to": 1 },
        { "from": 14, "to": 1 },
        { "from": 2, "to": 12 },
        { "from": 12, "to": 11, "toArrow": "Diamond" },
        { "from": 13, "to": 11, "toArrow": "Diamond" },
        { "from": 4, "to": 13 }
      ]);

Thank you Walter.