How to remove learnable ability after learning it?

[SenPie69]

I have this ability that overrides a spell, what i mean is like this ex: spell 1(summon ward) is learnable but after casting spell 1, the spell then changes to spell 2 (thunder clap) -- basically think of this spell as a kunai of minato then dashes on it as targetable unit, its working as intended but the thing is, when i level up, the spell 1 will still show up as learnable despite its already maxed level, is it possible to remove that ability in learning but still exist to use? i tried searching manually and in the google but no avail....im sorry if i worded it wrong, im confused how to worded it properly lol

PS. while it is indeed working as intended, it was a mess i made (i was experimenting so that eventually i can master modding complex spells without googling everytime) but it works nonetheless