Use relevant

I want to use Flowable to solve workflow problems。My workflow is as follows。In the initiation process, multiple people can be set to reply to questions, and the number of people is not fixed. The approval will be carried out after all the replies are completed. If the approval fails, it needs to be returned to the corresponding responder and then reply again.How to set a node if the number of people responding is not fixed? Or can multiple people operate a node? Thanks！