In P4V 2008.1 and later, bookmarks are saved in:
Note that xxxx is a number defined in ".p4qt/connectionmap.xml" for a specific connection to the server.
Currently, there is no built-in method to transfer bookmarks from one machine to another. A possible workaround is to:
Identify the xxxx number in "connectionmap.xml" on the source client machine, and the xxxx number in "connectionmap.xml" on the target client machine.
Then, copy the "bookmarks.xml" file from the source machine to the corresponding ".p4qt/xxxxClients/" folder on the target machine.