@Jaijaisy The workflow you are noting is possible but not in the scenario where both documents are on the envelope from the beginning. Document Visibility might get you to a certain step in the process but you cannot activate new fields for the same Recipient but at a later Signing Order on a secondary document by that same Recipient completing fields on the first document. You could set an order so that the envelope comes back to you after Recipient A has signed Document A in which you (as the Sender) then add Document B and Recipient A fields on document B. So the workflow might look like this
Send envelope with document A
Recipient A signs document A
Envelope returns to Sender (Allow to edit)
Sender adds document B and document B fields for Recipient A
Recipient A signs document B
*** Recipient A is in two spots on the envelope workflow as Signing Order 1 and Signing Order 3 in this scenario.
You could use Templates as overlays to accomplish the addition of the document B and fields. This scenario would only allow the download of both documents after the envelope has been updated by the Sender or at completion.