QB is only allowed to use 1 currency in 1 transaction. You may open a virtual bank account at TW to deal with multi currency transactions and run the bank feeds.

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QuicBooks Online support multi-currency, deepthi-gopineed.

This feature is available in our Essentials and Plus versions. You'll need to turn it on first and set it up. 

1. Go to the Gear icon and select Account and Settings.
2. From the Advanced tab, select the Edit in the Currency section and choose your Home Currency.
3. Select the Multicurrency checkbox and confirm that you understand that you can't undo this option.
4. Click Save and close.

Once done, you can add to the currencies you want to use. Please check these articles for more details:

• Multi-currency FAQ
• Turn on and use multicurrency

Post again here if you need anything else. Wishing you all the best!