Many merchants create items with multiple options. However, these options will not be part of the BOM list as our system is unable to include the BOM for items in the options list.
To mitigate this, you will have to construct your products using variants instead.
Item: Premium Siew Mai
Choice of Meat - Pork, Chicken
Choice of Topping - Black Truffles, Caviar
Pork and Black Truffles Siew Mai
Pork and Caviar Siew Mai
Chicken and Black Truffles Siew Mai
Chicken and Caviar Siew Mai
You can learn more about variants and options here.