Is it possible to place new checkpoints

Hello, I would like to know if there is any possibility to place new checkpoints on certain courses in such a way that I can save them and then use the same set of checkpoints again. I would be very grateful if someone could help me with this.
Thanks in advance.

Peter

 

you can create a race with the quickrace ui app. or in the world editor with the race editor.

 

But without any opponents, and on any existing racetracks? And I can use that set again and again?
--- Post updated ---
Ok, I could create it, bit how can I load it and play?