Complex custom ability...
 

I am trying to set up an ability on a Configurable that has the following characteristics:

- You can choose between 6 different versions of the ability (set up as Custom abilities)
- A starting character can have anywhere between one and 6 of these, but a max of 1 of each.
- After level 1, a spell casting character gets 2 per level, while a non-spellcasting character get 1 per level.
- The total number of each version of the ability selected by the character can be no higher than the character's total level (like skill ranks, in effect, but these are not skills).
- The score for each version of the ability is the total number of times it has been chosen. This can be modified by other abilities or items.

I can't seem to find my way around to...
1- Set up a chooser/incrementer for the base number of the ability at level 1 (1 to 6)
2- Subsequently add the correct number of extra abilities

and keep all that under the same Configurable umbrella ability.

Pointers to existing things that can guide me are welcome! Thanks!