In this blog you will see how to create group using K2 Workflow in SharePoint 2013 Online.
I have created a custom list named “K2 Workflow Tutorials” in which K2 workflow will be created to create a SharePoint group.
Go to K2 designer, drag and drop Create Group step from Groups workflow steps in the ribbon interface.
Specify properties for the group and then click on Ok button.
Deploy the workflow. Create a list item with title field value as “K2 Test Group”. After few minutes the workflow will be completed and a new group named “K2 Test Group” will be created.