Cancelling workflow in sourcing7

Hi,

I am using sourcing 7. My question is, how do I cancel a workflow? I do not see Workflow Definitions -> Current Workflow Processes in sourcing 7.

Scenario: Contract document is submitted for approval. Approvers receive an email to take necessary action on the document.

System admin logs in and wants to cancel the workflow. After this the Approvers should not see the pending action item and contract document status will move back to previous phase.

Appreciate any help.

Regards

Moumita