No, you can't take ALL honey from a hive. if the comb is mixed-some brood, some pollen and some honey, you definitly don't wanna take it out. by taking it out you would kill the hive-if you take all of them out. you take only what you have in so called "supers", usually you don't take out combs from the brood chamber.
when bees process nectar they turn it into honey. they essentially take away the moisture-from 80% of water only some...16% are left in honey, when the honey is rippen they cap it-with wax. when you uncapp the combs they are ready for extraction, without unccaping you can't extract the honey. what to do with those cappings?? some wash it with water and feed that to bees, but most beekeepers wouldn't advise you that-possible disease transfers. so try to uncapp it in a way you will take as little honey as possible with the cappings. then, when you get a lot of cappings, cook them like wax-so you have them in a nice cake and ready for sale.