Dear Ade Brian Mustafa sorry to see that your interesting technical question has not yet been answered by experts. As an inorganic chemist I'm ansolutely not an expert in this field, and personally I never used this software. I assume that you already checked all handbooks and tutorials which are available on the gabi-software.com homepage. Pease also have a look at the following freely available handbook:

GaBi Manual

https://gabi.sphera.com/fileadmin/GaBi_Manual/GaBi_6_manual.pdf

This manual is freely available as public full text (see attached pdf file).

It might also be worth having a look at the answers given to the following closely related question which has been asked earlier on RG:

Anybody familiar with End of Life modelling(i.e. recycling) on GaBi?

https://www.researchgate.net/post/Anybody_familiar_with_End_of_Life_modellingie_recycling_on_GaBi

(6 answers)

I also suggest that you search the "Publications" section of RG for terms matching your question, e.g.:

https://www.researchgate.net/search.Search.html?type=publication&query=LCA%20with%20GaBi%20software

I hope this helps. Good luck with your work and best wishes!