Hello Omal,

Upward Traceability :

• It runs from the raw materials received from the supplier and follows the chain to the finished products delivered to customers.
• Note that the name is confusing - this would often be considered a downsteam direction. Think of it as Where Used.

Downward Traceability :

• It follows the product in the other direction, from customer to the different suppliers of raw material.

• Note that the name is confusing - this would often be considered an upstream direction. Think of it as Where Supplied.

You can get more idea from this Document.

Thank you.