TripleGemStudent,
by “transcendental” kusala-mula p.s., you may have meant puñña kriyā. Lal explained puñña kriyā in the post I referenced.
An arahant still does puñña kriyā, but not kusala kamma, since as Lal explained, there are no more defilements to be removed. puñña kriyā is possibly what you were trying to convey.
Lang