In the Schematic view, click
in the Camera View toolbar and select Create Bookmark from the menu that appears.
In the Create Schematic Bookmark dialog box that appears enter the name of your bookmark.
Your bookmark appears in the menu and is listed as the current bookmark at the bottom left corner of the view:

Tip: When you have many bookmarks in the schematic view, you can cycle through them quickly with the Alt + B shortcut.
Make changes to your nodes in the Schematic view.
When changes are made to the current bookmark, an asterisk (*) appears beside the name of the bookmark in the bottom left corner of the view:

Click
and select Update Current Bookmark from the menu that appears.
The changes are saved to the bookmark and the asterisk disappears from the bottom left corner.
and select Rename Bookmark >
and select Delete Bookmark >