Where to file W2C from 2023 for corrected residence state that has a different Tax level.

[thegingninj]

Hello there, thank you for reading. 

My original W2 from 2023 that I filed had an old address in Colorado on it; I had actually moved to Texas just before the year began. Since CO has income tax and TX does not, I should be due a refund from CO. 

My employer just sent over a W2C with the correction, but I'm not sure where to file.  Do I amend my 2023 Federal W2 through Turbotax, or add the W2C as a second W2?  Or do I need to just file directly with the State of Colorado? 

Thank you again!

Gordon