The option to 'Add Workflow' can be found on the iPad & on the Web:
Refer to THESE instructions.
This feature will allow you to add workflow from another template to your existing template.
From the iPad you will then be given a list of templates to choose from that include workflows.
From the web all the templates will be available, but should you choose one that doesn't include workflows you will see this alert:
Once you choose your workflow, you will then have the options to REPLACE or ADD them to the existing template, as explained in the following video: