An architect or builder can create a new element template.
There are two ways of creating an element template:
Creating an element template from scratch:
Go to your templates library: by clicking “Templates” from the top menu bar.
Click the “New element template +” button (displayed in the top left hand corner).
This will open-up the new element template in an element template builder window (initially with a blank element template).
You can start the process of building this new element template by clicking inline on the “My new template” title and re-naming it.
You can now start to add content areas to your template, in the same way you would add content areas to an actual element (see: How do I add/manage content areas within an element?). The only difference is that you cannot add specific content (e.g. documents, links, expert-tags) to a template.