I have pgAdmin version 1.16.1
So, for exporting table dumm I do:
Right click on table, then in menu click on backup, then in
Using PgAdmin step 1: select schema and right click and go to Backup..
step 2: Give the file name and click the backup button.
step 3: In detail message copy the backup file path.
step 4:
Go to other schema and right click and go to Restore. (see step 1)
step 5:
In popup menu paste aboved file path to filename category and click Restore button.