Fed return file and accepted electronically but omitted a W2. I know to wait and filed an amendment return for Fed. Since State return was to be filed by mail and hasn't

Fed return file and accepted electronically but omitted a W2. I know to wait and filed an amendment return for Fed. Since State return was to be filed by mail and hasn't been filed yet. How can I add-in the W2 for a correct state return without corrupting the TT existing Fed file for a future Amended Fed return.