So you can add manual accounts, and then update the balance and add transactions manually - or you can use our feature called Smart Rules.
This basically lets you link an offline account with online transactions. For me it works well for any money that comes out of my current account and gets transferred into a savings acc/ premium bonds
For any investment account, smart rules would only show you the balance increase by the amount you topped the account up. However, we are also working on this… Tracking Stocks and Commodities 