Hi userlankai,
I want to welcome you to the QuickBooks Community. Know that you'll find support from fellow members and a wealth of information within these articles. QuickBooks Online Essentials and Plus accounts have the benefit of the multicurrency feature. Let me explain how multicurrency works in your QuickBooks Online.
The currency assigned to the account, customer or supplier is the currency the transactions will be recorded in. The exchange calculates for you, so you don't need to worry about it. Once you create a supplier or customer, the currency is set and can not be changed. You can make the supplier inactive and create them in the correct currency. Here's an article that contains more details about using multicurrency: Learn about Multicurrency.
I'll be here if you have any other queries. Have a great day!
