how do i set the logic for multiple choices?

Hi, all

I’m trying to make order form using typeform

I have to make multiple choises but can’t find how to set the logic 

for example, i have  A, B , C choices

then there are 7 result (A, B, C, A&B, A&C, B&C, A&B&C)

i know the way i set the logic for just A then go to end ,   or A&B&C  then go to end

but how do i set the logic for A&B or B&C or A&C ?

customer wants A & C

he checked A , C 

then next question page shows question about A

like “how many A would you buy ?” then i want to make next question go to question about C, skipping the question about B

did you get it? english is not my first language 

lt kind of ackward to you but i hope you understand my situation.