transfer a project with completed tasks creating a new project with ALL tasks undone.

I have a project called "education". Inside the project, I have around 90 tasks left, and 38 done. (total 128 tasks)

For my needs, I need to create a new private organization and copy-paste the project in it.

I did it, and in the result, i got 128 tasks unfinished. While I expect to have these 90 tasks which exist in my previous project.

So, my suggestion is next:

add an option (checkbox) when moving projects between organizations or copy-pasting them, like "mark completed all tasks which you done previously in a new project"