hmmm....
you could get the sql query for the table you want to duplicate and in that sql query you could just change the table name and poof you got a dublicated table with different name
example(original table):
[sql]
CREATE TABLE blahblah.....
[/sql]
example sql query for duplicate of original:
[sql]
CREATE TABLE blahblah2....
[/sql]
so basically just change the table name of the original table's sql query and you have a duplicated table