Levels and spell book morph problems

[RedFlash]

How can I make my map with heros that level except a couple of my heros have spells books and they morph even if I do use trigger to add them the spell books back how would I be able to add the spells in the spell book they learn when they do morph?
Basically I got a hero that morph that uses a spell book that spells he learns gets transfered into it but the spells dissapear when he morphs