To generate a Mythus Prime persona from an Amazing Engine player core, the first thing to do is determine the three TRAITS.
The Physical TRAIT is the sum of the Fitness and Reflexes scores
The Mental TRAIT is the sum of the Learning and Intuition scores
The Spiritual TRAIT is the sum of the Psyche and Willpower scores
SEC is determined by dividing the Position score by ten (rounding as necessary), and adding 1.
ATTRACTIVENESS should be rolled, although the JM may allow 1/2 the Charm score in its place.
Note: This can potentially result in scores above what is normally allowed for starting characters, so it is always best to clear any such imports from other gaming systems with your JM first!
Then, since the Player Core is nothing more than the attributes, select a Vocation and complete the HP generation as if it were a Mythus Prime persona.
(Gee, that was simple, wasn't it?)