Greetings Urbzzz,
Thank you for using Apple Support Communities. It seems like you want to delete Messages in iCloud to save space. I would recommend you read this article, it explains how to delete texts and attachments in Messages when they are in iCloud.
When you use Messages in iCloud, all of your text messages and the attachments you send and receive use your iCloud storage. You can make more space available when you delete texts and attachments—like photos, videos, and files—that you don't need anymore. Follow the steps for your device.
To delete a message or attachment, follow these steps:
- In a message conversation, touch and hold the message bubble or attachment that you want to delete.
- Tap More.
- Tap
, then tap Delete Message. If you want to delete all messages in the thread tap Delete All, in the upper-left corner. Then tap Delete Conversation.
To delete an entire conversation, follow these steps:
- Swipe left over the conversation that you want to delete.
- Tap Delete.
- Tap Delete again to confirm.
Want to delete more than one conversation at a time? Open Messages and tap Edit in the upper-left corner. Then tap the circle next to the conversation and tap Delete in the bottom-right corner.
Manage your iCloud storage
Take care.