There are 4 product's type currently available at Ricemill:

• Simple
• Bundle
• Configurable & Variant 

Simple type

• Standalone basic type of product that's has no dependency on any other products type.
• Can be upload to any sales channel.
• Inventory qty standalone.

Bundle type

• Allow you to combined of 2 or more simple type product to form 1 bundle product.
• Availability(Qty) depends on the qty of simple product that included in bundle.
• Can be upload to any sales channel.

For example:

2(qty) Simple_A + 2(qty) x Simple_B = 1(qty) of Bundle_C

• If Simple_A and Simple_B both have 2(qty) in stock, then 1(qty) Bundle_C will be available.

• If Simple_A and Simple_B both have 4(qty) in stock, then 2(qty) Bundle_C will be available.

• If Simple_A has 1 left and Simple_B have 2(qty) in stock, then 0(qty)  Bundle_C will be available.

Configurable

• Allow you to create product that has option like Size, Colour.
• It will create child item (Variant) with the option select.
• Availability depends on the qty of its child product (variant).
• Only Parent (Configurable) can be upload to sale channel.
• A Variant cannot be uploaded to any channel by it self.
• A Variant will be uploaded to channel with configurable as the selection like colour, size

• Configurable only show sum inventory qty of its variant. 
• Each variant has it own inventory qty record. 
• If one of the variant(child) is out of stock, other variants will still be available to sell with Configurable(Parent).