From Guild Wars 2 Wiki
The manuals must be used in order. You can't wait until level 60 and then just buy the Grandmaster's Training Manual; attempting to use it produces no effect unless you have also used the Adept and Master Training Manuals.
 List of Training Manuals
- Double click to use. Makes your trait lines available. You will be able to spend up to 10 points in all lines. Resets trait allocation. Required Level:11
- Double click to use. You will be able to spend up to 20 points in all trait lines. Resets trait allocation. Required Level:40