Q: deleting imessages

Greetings ddatzm,

Thanks for using the Apple Support Communities!

From your question, it sounds like you would like to delete some messages from the Messages app on your iPhone to free up some space. If this is correct, the following article explains how to delete a message or conversation. 

Delete a message or conversation

To delete a message, follow these steps:

1. In Messages, touch and hold the message bubble you’d like to delete, then tap More.
2. Tap . If you’d like to delete all messages in the thread, tap Delete All.

To delete a conversation, open Messages and swipe right to left on the conversation. Then tap Delete. You can also open Messages and tap Edit. Then tap  next to the conversation and tap delete. 

Deleting messages and conversations is permanent.

Use Messages with your iPhone, iPad, or iPod touch - Apple Support

Have a great day!