With complex combos I just take each individual morph on it's own since the genetics are mutually exclusive and then you multiply them for odds.
In relation to your example this would mean:
axanthic x het axanthic = 1/2 axanthic 1/2 het axanthic
pastel x pastel = 1/4 super pastel, 1/2 pastel, 1/4 normal
spider x normal = 1/2 spider, 1/2 normal
So to get an axanthic/super pastel/spider (aka axanthic killer bee) you would take
1/2 x 1/4 x 1/2 = 6.25%
And for a pastel axanthic
1/2 x 1/2 x 1/2 = 12.5%
For a super pastel het axanthic
1/2 x 1/4 x 1/2 = 6.25%
In general with the above example if it's a super pastel or has no pastel in it the combo odds is 6.25%, if the combo is pastel and anything else it is 12.5%.
Hope that makes sense 
>>Sorry for asking so many genetic questions. I'm just trying to learn this stuff, and I need to double check myself.
>>
>>Would this pairing give me:
>>12.5% Spider - Het Axanthic
>>12.5% Axanthic
>>25% Bumblebee - Het Axanthic
>>25% Pastel Axanthic
>>12.5% Axanthic Bumblebee
>>12.5% Axanthic Killer Bee
>>
>>This Axanthic gene is driving me crazy for some reason.
>>
>>thanks again,
>>Ken
>>-----
>>1.0 Spider Ball Python (Sarki)
>>0.1 Pastel Ball Python (Panthea)
>>0.1 100% Het Albino Ball Python (Hazina Adamma)
>>1.0 Albino Ball Python (Apu)
>>0.5 Normal Ball Pythons (Norma, Nova, Nala, Nimeesha, Nyoka)
>>
>>1.0 Desert Tortoise (Tubbs) from Tortoise Rescue
>>1.0 Boxer (Shadow)
>>
>>
>>www.ocballs.net
>>kvandoren@ocballs.net
-----
John Dague
JD Constriction
www.jdconstriction.com