There's a new field name Association on the workflows form in the AX 2012.
The Association field defines what organizations the workflow configuration is active in. In Microsoft Dynamics AX 2009, each workflow was company specific. In Microsoft Dynamics AX 2012, a workflow can be used in the following ways:
It is not possible to change the Association for created workflow, because it depends on document processed within the workflow. The association parameter is defined on WorkflowType. E.g. Customer payment workflow type is defined as Company associsated, on the other hand Purchase requisition review workflow is defined as Global.
The list of worklow types together with association can be found on technet.microsoft.com.