Hey Panel!
Basically here is an example of my simplified problem: I have a row A that has a Special IDs, What I want to do it complete a sum product for each special ID. So D1 = B1*C1, D2 = B1*C2+B2*C2... Then D4 = B4*C4, D5 = B4*C5+B5*C4...Then D7 = B7*C7, D5 = B7*C8+B8*C7
Visually is kinda...