It can be done just in a different way than how the combos come out when you pair a Male x Female. It can be rather labor intensive too.
Basically you would just search the "morph list" for the genes you wish to see preferable in a already known combo like a Bumblebee for example. That will give you a Pastel & Spider combo. Than the list will include all up to date possible combinations. It can be rather a long list depending on how established the morphs are.
Now remember World of Ball Python is not exact. With the degree of variation within each genes make up some combos can be slightly or drastically different looking, and there are also a few errors with some of the combos on how they are labeled. Its a great resource, but nothing like 1st hand knowledge.