multilevel sharing sheet feature in V3 no longer available causes big issue

multilevel sharing sheet feature in V3 no longer available causes big issue

in the new version, we cannot set up the sharing based on each private sheet.
  • nota : it would have been nice to announce it before doing it, to work out how to update the case
We had many "private" sheet using datalink from other sheet from the same document.
We had to take them out as they are private and put them in a new sheet document

But now, still, we need the datas from the shared sheet as input in the private sheet document.

how can I link them together ?

how do you save the bad situation in which I am stuck now ?

please HELP

regards

Daniel