What do you mean with convert sheets?
To use the classical RM2 approach to learning spell lists the character spends DPs during level up and chooses the Learn Portion skill (or maybe to make things really tidy they could add a specialization of Learn Portion indicating the list and portion they want to learn, for example Fire Law B). If the portion implies a different cost it should be changed manually by editing that skill.
After level up is complete, the player checks the chance to learn the list, rolls, and if successful must manually edit the Learn Portion back to 0 ranks (or delete the skill if they created a specialization), and then manually add or modify a skill for the spell list with the number of ranks equal to the maximum spell level learned. If they fail the roll, or the gaming group is not allowing rolls and requires 20 ranks to learn the list, then the skill is left there as it is until the next level up.
Let us know if that helps.
Thanks for asking!