I cannot use a bank account as 'Account Type' and stock in 'Detail Type' - if this is what you meant for creating a "Clearing Account" (an account where I can adjust inventory quantities) because  "Bank" does not appear in the scroll down menu. The only option present "Cash at bank and in hand" in 'Account Type', does not allow to use 'Stock' as an option in the scroll down menu of 'Detail Type'.

It may be that there are differences in the UK and US versions of QBO.

As 'Stock' (Inventory) is a Current Asset, couldn't I create a Stock Adjustment Account with 'Current Asset' as "Account Type" and 'Stock' as "Detail Type" ? Do you know whether this may work and how would it affect the financial side of the inventory?