Do you mean copy the code generated by the Meta Box Builder?
If the code is not for user profile, settings page or taxonomies, then you can just copy it and deactivate the builder extension. It will work.
If the code is for user profile, settings page or taxonomies, you'll need the corresponding plugin activated (MB User Meta, MB Settings Pages, MB Term Meta). The builder extension then can be deactivated.
In either cases, you still need to keep Meta Box activated.