I have created a custom list named “K2 Workflow Tutorials” in which K2 workflow will be created to delete a SharePoint list.
Go to K2 designer, drag and drop Delete List step from Lists workflow steps in the ribbon interface.
Select a site collection from which the list has to be deleted and then click on Next button.
Specify filters for the list to delete and then click on Next button.
Specify whether to use the recycle bin and then click on Finish button.
Deploy the workflow. Create a list item with title field value as “K2 Test List”. After few minutes the workflow will be completed and the list named “K2 Test List” will be deleted from the specified site collection.