Welcome to the community!
What phone do you have? Some phones allow users to forward text messages on an individual basis. You would need to determine whether your particular device allows such forwarding. To automatically forward messages, you might need a third-party app. You can read more information here, here, and here (as well as other sources). I have not used any of the apps mentioned in the links so I cannot vouch for their services. You would need to find an app which suits your needs.
Hope this helps 😀