Often, duplicating a table is not a good idea, but there are times when it is useful.
In FileMaker Advanced, you can copy and paste to duplicate a table.
In FileMaker Pro or Advanced, you can use Insert Records and select "new table" as the target table to duplicate a table. This also imports one or more records into the new table, but you can easily delete those records after import if you do not want the data.
Thanks! That worked. Though it is Import Records (not Insert Records).