To model a light fixture with multiple heads for point-by-point photometrics, it is necessary to insert each head as a separate light in Design Master Electrical.
In the “Light Fixture Project Schedule”, you will want to create a fixture that represents a single head. Choose an appropriate graphic for the single head. You can uncheck the “Include in Schedule” toggle to have this fixture not be displayed in the schedule you insert on the drawing.
If you want to circuit a single fixture that has the total light load on it, you will need to create another fixture to represent that. This fixture you will want to include on the schedule you insert on the drawing.
Insert one fixture on the drawing for each head. Insert a fixture to be circuited also, if appropriate. These fixtures might end up stacked on top of each other, depending upon how your fixtures are arranged on the drawing.