Here, you can easily move the current page to anywhere on your sitemap by dragging and dropping its icon.
When you drag the page's icon, you can drop it on top of an existing page, or between two existing pages.
When you release the mouse button, you have options: to move the page on its own, alias the page to another location (i.e. have the page appear in two locations), or copy the page and any child pages (sub-pages) it has.
Moving a page will change its location in the Sitemap entirely.
Aliasing a page creates a pointer in the new location that redirects to the original page in the original location on the tree.
Copy makes a new instance of the page (and potentially its children).