"Import code?" Do you mean the EIN---the Federal ID of the employer? It is in box b on your W-2.
If you have the W-2 in hand then there is no reason that you could not just enter it yourself by keying it in, box by box. You are not required to import it.
W-2's come from employers. If your employer is partnered with TurboTax to allow the W-2 data to be imported into the software you can do that---but you need the actual W-2 so that you can enter the EIN and the amount from box 1 to import the other data from the W-2---which just saves you the little bit of keying in of the other information.
Every 2022 W-2 that you received must be reported on your 2022 tax return, even if they are for small amounts. Remember that each one of those W-2’s has your Social Security number on it, and that income was reported to the IRS by the employer. You do not want to get in trouble with the IRS for under-reporting your income.
ALL of your W-2’s must be entered on the SAME tax return.
Go to Federal>Wages & Income to enter a W-2.
After you enter the first one, you click Add Another W-2.
W-2's come from your employer, and they have until January 31 to issue it. Some employers allow you to import the W-2 through the software, but for security reasons you still need information from the actual W-2 to import it. You might need to phone, drop in, email and/or snail mail an old employer to make sure they know where to send your W-2.
https://ttlc.intuit.com/questions/2561916-how-can-i-get-a-copy-of-my-w-2
https://ttlc.intuit.com/questions/1934390-how-do-i-import-my-W-2
https://ttlc.intuit.com/questions/2588751-why-can-t-i-import-my-w-2
https://ttlc.intuit.com/questions/2938482-how-do-i-take-a-picture-of-my-w-2-in-turbotax-online
Or are you referring to the Control Number in box d? That number is not necessary when filing a tax return so you can leave box d blank (empty). If the TurboTax program still gives you an error for box d then delete the W-2 and re-enter the W-2 manually to remove the program error.