Share A Custom Page
As a subscription, workspace, or project administrator, you can create a custom page and share it with other users. When a custom page is shared, all users in selected projects will see the page available in their menus.
When creating or editing a custom page, select either the Share with all projects checkbox, or one or more projects in the Share with selected projects field in the custom page editor window to enable sharing of the page. Only administrators will see this option.
Hope that helps.