reference pairing

Hello all,

I need your help with a little issue.

I have several machin that can produce différents goods. but sometime, my machine have to produce twins references.

the point is that i have to plan the production and sometimes, i have differents needs on each one.

unfotunately, the part A need 0,5 sheets of material and the part B too

if i need to produce 100 A and 50 B, i will buy 75 sheets, but actually, i need 100 sheets to deliver goods on time.

do you have any idea for me?

thanks