A second workflow is required for a campaign.
Is it possible to create it for the same campaign?
Or only one workflow is allowed per campaign and so I need to create a new campaign for this workflow?
Appreciate all your replies.
You design as many workflows as you want within a Campaign.
Under targeting and workflows, you have the option to create new workflows:
Only thing you need to make sure is your logic for workflow design is related to that campaign, so that you can check campaign later whenever needed.