I cannot follow your instructions
if A=55%B+32%C+9%d+3%e+1%f
B=50%b+50%b'
C=70%c+30%c'
Is this what you mean?

If
A = 55%
B = 32%
C = 9%d + 3%e + 1%f

B = 50%b + 50%b'
C = 70%c + 30%c'


Is this not the same as this Post? Or at least an extention of it?

bill of material (multi)