Let me guide you in importing a bill in QuickBooks Online.
You can prepare and use a CSV file to import your data accurately. You can use this sample.pdf to guide you with the following mandatory fields:
Bill no.
Supplier
Bill Date
Due Date
Account
Line Amount
Line Tax Code
There is also an example of a data file available for you to download when you try to import your data.
Once you're file is ready, you can follow these steps below to import your bill.
Like this:
Go to Settings ⚙️, then select Import data.
Choose Bills.
Click on Browse.
Select your .csv file, then Open. If you would like to auto-create suppliers, just tick the checkbox beside Add new suppliers that don't already exist in QuickBooks.
Click on Next. and select the data format you've used.
Map all mandatory fields and hit Next.
Tap Start Import to begin the process.
Once completed, an import summary will be displayed. Note any bills that didn't import and why, then select Done and you'll see a final completion summary.