I'm not sure I understand your question. Technically when you start the game your a level 1 everything (level 1 warrior, level 1 white mage, level 1 monk, etc.) and you have to build all the levels separately. Once you hit level 20 though, you can do a quest that will allow you to have 2 classes at one time, a primary and sub job. You can assign any job to be primary and any job to be sub, the only stipulations are that your primary job is the only one that will gain experience, and your sub job can only be HALF of your primary job. You may have a 30 levels of monk, but if monk is your sub job and you have a 20 warrior as the primary, then you will only have a 10 monk. Also, if you used a monk all the way to level 20 and never put a level into anything else, did the sub job quest, decided to keep monk as your primary job, then any sub job you picked would be at level 1 (since you never leveled any jobs past that). Again, hope this made sense =/.

Leighton