Assistance please. New Employee and IIF file error.

I'd be delighted to assist you in seamlessly importing your IIF files, @CWarck.

Yes, your plan of action is the best course. I'll guide you through the process. 

To begin with, you can follow along these steps on to delete the imported file.

1. Go to the Lists menu in your QuickBooks Desktop (QBDT) and select Chart of Accounts.
2. Click to open the account that contains the transactions you want to delete.
3. Scroll to the transaction in the account screen. QuickBooks displays transactions in date order, with the most recent at the top of the screen.
4. Click to select the transaction you want to remove.
5. Select Edit in the main menu and then click Delete.
6. Click OK to confirm the action.
7. Repeat this procedure for each transaction you want to delete.
8. To delete lists, go back to the Lists menu and select the listing you want to remove.

Another way is to find the most recent backup copy of your company file prior to the import and restore them. You can refer these links for the steps by steps process: 

• Locating Backups and Company Data Files
• Restore a backup of your company file

Additionally, you can look for a third-party app that lets you delete those imported transactions by batch. Just hover to the App Center and browse for an app from there. Once you've found one, click it and select Get app now to link it to your QBDT.

Once done you can now add your employee to QBDT and re-import your IIF file.

Furthermore, I'm adding this article that you can read in case you want to learn how to enter prior payroll to your employees: Enter historical payroll data in QuickBooks Desktop Payroll.

I'll be around if you need more help with your employees and payroll. Keep safe and have a good one!