I assume you mean copying the appearance of a lord/companion for your main character. If so then yes.
Go to lords/companions.xml in the folder Mount & Blade II Bannerlord\Modules\SandBox\ModuleData. Find the lord/companion you want and copy the <BodyProperties version="4" key="a bunch of hexadecimals" /> (ctrl c) and when in the character creation (can do it anytime by pressing v) simply paste it in (ctrl v).