Besides of deleting whole conversations, you can also delete single SMS/Messages from your Huawei Smartphone. By simply tapping and holding you can select the message and delete it. 

Android 10 (EMUI 10.0)
Step 1:  Open  Messages
Step 2:  Tap on a  conversation
Step 3:  Tap and hold the  message  you want to delete
Step 4:  Tap on  delete
Step 5:  Confirm with  Delete
  1. Open Messages
  2. Tap on a conversation
  3. Tap and hold the message you want to delete
  4. Tap on delete
  5. Confirm with Delete

Huawei Instructions
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