Sub page's sub page url

Hi i have a problem.
I have home,product,contact menu.
I made product/a, product/b after that add another subpage to product/a. then url is “/product/new page.” but I want to make it like “/product/a/new page”
is there any way to make subpage’s subpage???

Yes, of course.

If the URL is product/new-page, then you didn’t create a subpage of product/a but of product.

If you want to create a subpage of product/a instead, make sure that you have a pages section in the blueprint of the product template. This will then contain the subpages of the respective product page.