To setup a shipping table in magento you need to do the following...
1. Login as admin then go to System>Configuration
2. On lefthand side click on "Shipping Methods"
3. Expand the "Table Rates" column
4. Enable the table rate by using the dropdown and add a title and "Ship to Applicable Countries".
5. Use the top left "Current Configuration Scope:" dropdown and select "Main Website" to export and import your table rates csv files.
6. First you will want to export your table by clicking on the "export" button.
7. Modify the downloaded file.
8. Import your csv file.
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