I guess you refer to Stadium Tracks.
The Ring-CP inside another block is created with a tool called "Blockmix"!
With it, you are able to replace blocks after you built them in TM.
You then open the tool and there's a list of blocks placed.
You can then choose the block you want to place somewhere else and change it's X,Y or Z coordinates!
Unfortunately, I don't have such tool hanging around or a link to one, but
you should be able to find a good one by googling "blockmix tool" or sth similar!