When you first start to build a track in classic track builder first place a doughnut on a pole. Go to delete and delete it, you will see only the pole gets deleted. Now go to copy and paste and select all and cut. Now when ever you go to copy and paste you will have a doughnut that you can place anywhere without restrictions. It can be placed in roads, in water in anything, you can also hide a ring checkpoint inside one in stadium. This also works with the pigs on top of the inflatables in stadium, just delete inflatable and copy or cut the pig to paste anywhere
Yeah I know I have way to much time on my hands
