Confused about manually adding a new account

Trying to get my head around adding an unsupported account to my spreadsheet (HSBC Singapore)

I’ve followed the steps for adding transactions manually with a CSV but I see this does not maintain a balance for the account automatically. Do I also need to manually add the balance every time I import new data?

Yes, there is a link in the menu to update the balance on an account, or you can copy/paste from Balance History and change the date/amount.