So if I understand correctly the client can create a new category with a maximum of three levels deep navigation?
Yes Correct, they can dynamically add folder / page and product categories up to three level, no problem in doing that but to setup each frontmatter when they create new page that will have pages inside it would be a hassle I think for the client.
If so you can have Grav include default frontmatter when a page is created as pointed out in this post [ New pages with default frontmatter](New pages with default frontmatter).
Yes, that is the solution I needed :), I didn’t know we can also manipulate the “add page” entry with predefined frontmatter in the admin blueprint yaml file.
Thank so much bleutzinn for the solution, works great!