Combo's are just that they are a Combo of different genetics. So a Honey Bee (hypo Spider) is both Recessive and Dominate. There is nothing to be figured out. Established morphs are already genetically figured out. So by the time you get it you know whether its a co-dom or recessive.
With co-dom to recessive this depends on whether the animals are both Heterozygous or homozygous or a mix of the two.