I have created a custom list named “K2 Workflow Tutorials” in which K2 workflow will be created to create a document library. Please refer to my previous article to create a K2 workflow in SharePoint 2013 Online.
Go to K2 designer, drag and drop Create Document Library step from the Libraries workflow steps in the ribbon interface.
Specify a site collection and then click on Next button.
Specify properties to create the document library and then click Finish button.
Deploy the workflow. Create a new list item in “K2 Workflow Tutorials” list with title field value as “TEST” and description as “TEST library created using K2 Workflow”. After few minutes the workflow will be completed and document library will be created.