At the moment when a workflow is deployed it will be available on the K2 Management screen in whatever category it is deployed in. However, if you use a category structure layout of Forms,Views,Smartobjects and Workflows all workflows no matter what application will be for will be grouped under one folder.

It would be a great feature if we were allowed to organise the K2 Management screen so we are able to group workflows together say for example per application or project rather than just whatever folder they were deployed in.