It is possible to assign a group name to a workflow.
You can do that either when you create a new workflow, or by editing the header of an existing workflow.
You see the groups of the workflows in the workflow overview:
The groups are listed in the top where the group name is written in while on a darker gray background. In the image above the group is called Demo.
If you click a group, then the group is expanded and you can see the workflows inside of this group. Below the Demo group has been selected:
Here the workflow, Demo Create PDF is shown and it is marked with a darker gray on the left to indicate, that this workflow is a member of the group above.