Can a user have limited access to create, process and view specific invoices? There are certain types of invoices which are sensitive and we dont want admin staff to view

There is no such feature yet for both QBO and QBD. Consider to open a separate QBO account to manage those invoices and customers.

https://quickbooks.grsm.io/UK

You may consolidate both accounts if required later with another app.

Just my 2 cents.