Waterfall Chart

[djallelsadki]

Hello,

I want to get a graph as shown in the following scenario:
I have nine expressions A, B, C, A',B',C'......

with: C = A-B, C'=A'-B', .....

I want to get the expression "C" above B if C>0

and if C<0, C above the "A" expression

,

if someone can help me

Thank you,

Djallel SADKI