Mixy posted:2. You can just drag and drop track pieces from the selection panel to the drawing plot. To connect the dragged track to another, already laid in the plan, make both end arrows to overlap and color in red and green and then release the dragged track.
Now that I use SCARM more often, I think I need to go back and read through the documentation again because I totally missed this tip too and I'm constantly selecting the wrong orientation on curves, switches not so much.