Welcome to GTAM.
If you import the scoots there is a procedure - Google "Registrar of imported vehicles" and you can read up on the process. For road vehicles it can be a bit of a hassle, needing documents and such from the manufacturers confirming that any and all recalls have been completed, etc etc...so you should definitely weigh the pros and cons of transporting them across the continent and then jumping through all the hoops...vs selling them and buying new here instead.
You living right downtown? Unfortunately you are stuck in the middle of an asphalt wasteland that takes at least 1+ hours to get out of before you get to any decent riding roads (and an hour or more yet before you get to any good ones) but compared to what you might have been used to out in CA (depending on how far/where you rode) our "good" roads may seem boring in comparison, but it is what it is.
What kind of bikes do you ride?