how start chain with different start condition ?

Hello,

I try to find the best solution to setup a complexe chain.

When all predecessors have status "completed or error" , I have a solution.

But if one of predecessors failed the reaction should be different , skipping some next step.  In this case I don’t find a solution.

note that each box is a chain with a couple of steps of other chains.

Have you an idea, suggestion ?

thanks,

Delphine