Bulky Models with the Bulky special rule cannot Embark on a Transport unless the specific Transport type allows it. In addition, models with the Bulky special rule count as two models for the purposes of determining how many models a Transport can carry.
Chain of Command Detachments with the Chain of Command special rule can only be issued an Advance Order unless instructed otherwise. If an Independent Unit (see page 91) contains only models without this rule, then that Independent Unit can be issued another Order, even if the larger Detachment can only be issued with the Advance Order.