In order to fit best the level in the report output, I'll prepare a sheet that includes all data content, subtotals, and totals. Such sheet is tailor-made for reporting function only. I don't want other Qlik users from the company to see this sheet. Is it possible to allow us to build reports from a private sheet in the foreseeable future?

An alternative solution that also works for me is building the report in the Shared space that is not accessible by other company users. The problem here is company user is treated as "Internal parties". One of the limitations now in Tabular Report is the recipient must be able to access the app. We only allow company users to access apps in the Managed space. 

Looking forward to a good news on this. Thank you.