Hi there. ALKING. 

Allow me to share some information about 1099 in QuickBooks Online (QBO). 

Are you referring to EIN or State tax registration? If so, you can go to the Payroll setting to enter it. Here's how:

1. Go to the Gear icon. 

2. Click Payroll Settings under Your Company. 

3. Select Federal Taxes and enter your EIN, and click OK.

4. Click State Taxes and enter your state account number. 

5. Once done, click OK. 

I've also added this helpful resource that you can access to have a guide in case you need to make corrections to 1099-NEC or 1099-MISC forms after you e-filed them: Correct or change 1099s in QuickBooks.

I'm always around the Community if you have any other concerns about managing your Form 1099-NEC. Don't hesitate to post again here. Have a good one and keep safe.