When forwarding text messages you can always copy them one by one and paste them into a new conversation, but if you need to forward multiple text messages then follow these steps:
1. Open the Messages app and go to the conversation you’d like to pass along.
2. Press and hold on any of the individual messages and select the More option.
3. Go through and select the messages you want to send.
4. Touch the arrow at the bottom right and the messages you selected will all be ready for you to send to someone else.