From Tracker Software PDF SDK
Creates a new bookmark and inserts it as a child in the bookmark's sub-tree.
HRESULT AddNewChild([in] VARIANT_BOOL bLast, [out, retval] IPXC_Bookmark** pChild);
- [in] Choose whether the inserted child should be last or first in the bookmark's sub tree.
- [out, retval] Pointer to IPXC_Bookmark containing the newly created child.
Returns S_OK if the operation was successful, or will return an error code if it fails.