I have 2 Types of Products 'a' & 'b'.
Also I have 3 Modules Installed as Shipping Modules, say Flat, Table & UPS.
case 1: In selection of Product Type 'a' - Flat has to come.
case 2: In selection of Product Type 'b' - UPS & Table has to come.
case 3: In selection of Product Type 'a' + 'b' - All 3 must come with users to have choice to select between UPS & Table.
I have managed case 1 and 2 by updating shopping_cart.php, checkout_shipping.php and includes/classes/shipping.php.
All I could not manage is case 3.
Anyone who has faced and solved such problems....