You can combine the W2s if the second has only city information.  See below https://ttlc.intuit.com/replies/3302440

Hello, what if two w2s are from the same employer, but one w2 has most of the information filled out, while the other w2 only has boxes 15 and 16 filled out, but they are both from the same state? It is not letting me efile when I add a row to boxes 15-17, when the state is the same.