To create a copy of an automation, click the copy button in the actions column.
After you click copy, it will bring you to the Add New Automation page. This will allow you to select an owner for this copy and will automatically fill in the name and groups with the automation you are copying.
After you select the owner and add additional information press save and it will bring you to the step editor page. You will see that all of the steps from the automation you copied will already be here. You can add a new step by clicking the actions button and selecting "add new step". You can edit the existing steps by clicking the edit button in the row for the step.