We would like to signer (person A) to send the document to an additional reviewer (person B) before the signer (person A) can sign.

In some situations, we would like to signer (person A) to send the document to an additional reviewer (person B) before the signer can sign. This is dynamic and not determined by the sender. How do we implement such an option in eSignature 

Normal Flow:

Sender --> Signer A --> Complete

Dynamic Flow:

Sender --> Signer A --> forwards to Singer B for review --> Signer A --> Complete