The cool thing about professions is that you aren't required to make a choice, you simply goto the professions tab (available at lvl 10) and click a profession and setup tasks no choice required you can level them all up if you want . Its similiar to SWTOR that uses companions do the leg work for you. THey even have a web browser gateway you can use when your not in game.
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Do you mean crafting profession or character class?
Crafting, yes you can level multiple at once.
Character class, no.
The Enlightened take things Lightly