I have subscriptions in dollar, euro and swiss francs. For ex swiss francs are mainly private subscriptions. I have private subscriptions, professional ones for my company and professional ones for my clients and each subscription. So I created a folder for each type of subscription and currency. 

So I have :
private swiss franc
professional euro
professional swiss franc
professional $
professional for customers euro
professional for customers $
professional for customers swiss franc

Actually it's really difficult to know the amount, in the right currency for each type of subscription. I missed something ?

I saw that you plan to add currency conversion, maybe it will be a solution, but not a perfect one because conversion change a lot between those currencies. A currency per folder (and then you use conversion for the global statistics) would be great.
Thanks !!