Count total monthly products sold(in Gms.) on google sheet

Hello Guys!

I am struggling with counting total quantity of each product sold in a month.

Example: I want to have a stacked graph where I can view monthly quantity(in Size, gms) of Product A, B, C, D and E sold. Please feel free to make changes to the table accordingly.

Here is the link to the google sheet, I would appreciate your help alot.



Thank you!