Instead of manually inputing bill from supplier, is there anyway the supplier, who is also a Quickbooks online user, send us the data so that it will be automatic?

You may have a 3rd party app to create a billing form and share the uniform link with your suppliers. They need to fill in the details on the form and it will be integrated into your QBO account. You just need to match the data with the bill you received by email or other methods before proceed to pay it later.