Suppose that we analyse the speed of a car. Then important (lower level) properties of a car to consider are: an engine, aerodynamics, weight, etc. But there are also other properties of a car that are important for some other use, but do not affect the speed of a car in a direct way, e.g. the availability of airbags concerns the safety (rather than the speed) of a car.
Note, here the properties of the speed and safety are at the same level of an abstraction of a car. The properties lower from them, an engine and an availability of an airbag are at the same level of an abstraction of a car too.
I would like an English word (a noun or an adjective) for a property that:
does not affect the main property P1 of interest,
has a clear purpose and affects some other property P2 where the properties P1 and P2 as attributes concern the same level of detail.