Hi @Diamovida
Unfortunately, it is not possible to directly create hierarchical URLs for pages in Shopify, such as changing the URL structure from https://diamovida.ca/pages/lab-grown-diamonds to https://diamovida.ca/pages/loose-diamonds/lab-grown-diamonds. All pages must reside directly under the /pages/ directory.
Shopify does not support nesting of pages under other pages in the URL path directly.
Thank you
DP