Workflow process for Dynamic Level of Approvers

Hi All,

I have a requirement as below.

1. In a custom transaction and screen it will be decided how many levels of approvals and sequence (Dynamic not same for all the documents) will be required for that document.  And workflow should process approvals based on the sequence number.
2. Users will come to the same custom screen and they will click on custom buttons(approve/reject) (not from the SAP inbox)  from the screen specified for each user/sequence.

I have created Workflow with below process.

1. Step will decide who will be the user
2. Created a block step ( to process multiple users in the same sequence number).
3. Loop step to process all the users in the same workflow (but could not able to make this step properly).  Not sure how I can keep workflow in a wait position after user decision work item sent and till the person will take action (approve/reject) on the work item.

Question: Can we have same workflow to process all the users without completing the workflow for each user and completing the workflow only when all of the users approved on the document?

  Or should we need to start and close workflow for each user( independent workflow for each user)?

Please let me know your thoughts on this.

I am also attaching the workflow pic for reference.

Regards,

Mohan.