If you want to assign a workflow to a device, you should create a Config group consisting of that workflow, file hook, and webhook.
(See Question 5 to know how to add webhooks.)
Step 1: Once the desired Config group is created, click on the Systems tab.
Step 2: Select the system to which you want to assign a webhook.
Step 3: Select the Config Group from the dropdown menu having the workflow.
Step 4: Click on the Tick icon to confirm Config Group selection.
Step 5: The Group assignment for that system will take effect immediately after clicking on the ‘Reload’ button.