Don't make this more complicated than it needs to be - if you received money taxable under PAYE (i.e. on a P60), from a company that you are a director of and own >15% of, then it goes in Box 2.
It's a simple either/or, there's no question of splitting amounts etc. - any money paid to you by a company you're a proprietary director of, arises from your holding the office of director.
If you also had a regular PAYE employment in a company of which you weren't a proprietary director, then that would go in box 1.