Calculating Rollup Revenue

Hi

I am trying to calculate the rollup revenue in looker, I have multiple levels of hierarchy so the Revenue should roll up to the highest level. For Parent child relation we have parent account id in child account. I have table below for an example as to how I want data. Alphabets in table below are the hierarchy structure, Roll up revenue is sum of Direct Revenue.

Direct Revenue Rollup Revenue
A 275 sum(A,B,C,D,E,F,G,H,I,J,K)
B 250 sum(B)
C 225 sum(C,D)
D 200 sum(D)
E 175 sum(E)
F 150 sum(F,G,H,I,J,K)
G 125 sum(G)
H 100 sum(H)
I 75 sum(I,J,K)
J 50 sum(J)
K 25 sum(K)