Use the Editor to start creating your template content
Navigate to the Editor of the template you are creating (or editing)
A section must be added
Tick Add Content to start building
A view of subsections is available via the different tabs:
Basic - Select from one of the simple building blocks
Advanced - More pre-defined subsection
Copy - Copy an existing subsection from another Template
Select the subsection you want to use and tick Add
Ensure to Save and Publish your changes