i understood exactly what you are trying to accomplish the first time.
you need to crete a table to define the shipping settings like i descriped before:
settingID - primary key
settingName - varchar
settingValue - varchar
you will have 2 records, one for each shipping charge:
settingID | settingName | settingValue
1 | typeAShipRate | 7.00
1 | typeBShipRate | 0.99
create one recordset to lookup the typeAShipRate, another to lookup the typeBShipRate and add 2 set session variable behavioers, one for each recordset.
your shipping is not product dependent, it is product type dependent, so you will not be able to define it on the product level