in the installed version type ":gouserdata" and MC will go to the location where user data is stored.
(normally C:\Users\<username>\AppData\Roaming\MultiCommander\UserData )
There you find a subfolder named FS-FTP and in that a file named ftpsites.xml . this is the bookmark file.
Then start the portable version and to ":gouserdata" there and copy the file to that location.
(create the FS-FTP folder if it not already there)
