This is straightforward to do.
A tax code notice is sometimes called a P6 form. To import P6s, follow the steps below:
📌 Note: Before you can follow these steps, you must be set up to receive online forms with the HMRC. If you're not set up, please contact the HMRC and apply for them to enable this on your HMRC account.
Click Payroll and then click Paye Online, then select Paye Online.
Click Inbox, click Receive then click Update Workers.