Mark a Doc
Build the Notes you want to reuse — headings, tables, to-dos, draw, whatever layout items you need. Open More → Template → Mark as Template. Keep that Doc in a project so you can find it later.
Import onto a new page
Create or open the destination Doc. If the title is still Untitled and the description is empty, import can fill those from the template. More → Template → Import, then pick the marked Doc. Blocks append at the bottom of Notes.
After import
Edit the copied layout items. Create nested Docs yourself from the Docs tab. Shares are not copied — grant the new project separately if you need editors.
Unmark
On the source Doc, Template → Unmark as Template when you no longer want it in the picker.
