When use save as when saving a session, two things can happen:
1) You can save a new session and a copy of the route with the option to use a new name.
The accompanying session for this new route has the same name as the route with - Default appended to it.
2) You can choose to save a new copy of the session only with the option for a new name.
This will place the session copy or new version under the original route. When you check the sessions for your route, you will have two sessions listed. One will be the original, and the second will be whatever you named it including default if you let TRS22 do that without changing the name yourself.