If I understand correctly, you want to assess the product you modeled, and you modeled the entire life cycle until end of life, right? If you want to assess the product over its entire life cycle, make a "life cycle" (or so process), which takes e.g. the product before use and has input of the use phase and of the end of life as waste - you need to cut then the connections between these life cycle stages that you have created now. I hope this helps!