a little helpful tool is to adopt the following gene count:

a codominant or dominant counts as 1. a 100% proven het also counts as 1.

a super form counts as 2. a visual recessive also counts as 2.

in combos, you just use these rules and add it together. so for me a jigsaw is a 2, a killerbee is a 3 (its just 2 genes but there is super pastel in it), a killer spinner is a 4.

now lets rank the relevant stuff:

a het pied is a 1, as is a het axanthic.

a possible double het is somewhere between 0 and 2.

a visual pied is a 2. an axathic is also a 2. a 100% double het is also a 2.

pied possible het axanthic and axathic possible het pied rank somewhere between 2 and 3.

pied het axanthic and axanthic het pied rank at 3.

the visual double recessive is at 4.

now when you breed a 4 to a 2, you either get all 3s (axanthic pied to axanthic for axanthic 100% het pieds), or you get 2s, 3s, and 4s (axanthic pied to double het axanthic pied). Anyway it helps to always count morphs like this, also focus on the stuff ranked 2 and above, for a double recessive project the stuff ranked below 2 wont get you far. Work up from 2 to 4.