You can customize the URL structure for parent projects so that the child project will be mapped to a particular value.

By default, your child projects will be mapped to the subdomain for the particular project. If your parent's subdomain is `parent-test` and the child project's subdomain is `child-test`, then a page URL would be mapped to potentially something like [`https://parent-test.readme.io/child-test`](🔗).

If you customize the child pathname to, say, `custom-name`, then that URL above would change to [`https://parent-test.readme.io/custom-name`](🔗). You can navigate to the parent project's custom domain view, and set the Child Path Names below.