After initial setup for a new workflow of type Workflow with UI, you must set permissions for the workflow to let it be seen by appropriate logged-in users.
Set access permissions for your workflow from the Permissions page
in BlueCat Gateway. To open the Permissions page, click 
Settings at the bottom of the navigator on the left, then click
Permissions. (For more details, see Assigning page and REST endpoint permissions.)
After you set permissions, the new workflow will appear in the Available Actions menu for users who are members of the assigned groups, grouped by the Category that you specified for it.
You can now edit your new workflow's _page.py file with the code and functionality of your workflow.