Build a bookmark hierarchy
To nest bookmarks
Do either of the following to nest bookmarks:
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In the Bookmarks panel, select one or more bookmarks and click-drag it beneath the parent bookmark. A dotted line appears while you are dragging the bookmark, indicating where the bookmark will be placed.
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Right-click on a bookmark and select Add a Sub-bookmark. Then type a name and set its destination.
To move bookmarks out of a nested position
Select the bookmark or range of bookmarks and do one of the following:
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Drag the selected bookmarks directly underneath the parent bookmark.
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Right-click on the selected bookmarks and select Cut from the options menu. Then, right-click on the parent bookmark and select Paste after the Selected Bookmark from the options menu.

Nesting a bookmark (Left), and the result (Right)