Does RoboHelp do the following
|Support workflow visual display||Workflow graphic display showing a work stream with its related steps|
|Support workflow definition||Workflow definition: workflow stream and associated workflow steps|
|Association of workflow steps with knowledge management content elements||Linking of a workflow step to one, or more, knowledge management elements (text, image, video, and documents)|
This can be accomplished, sure. But it will require other tools. RoboHelp does offer a screen capture utility called RoboScreen Capture. But it's a manual thing. You would have to build the images, then insert them into RoboHelp.
Sorry, but this one needs more information before anything resembling a cohesive answer can be given. You need to explain that question in more detail.
Definitely possible to achieve using RoboHelp.
Hopefully this helps... Rick