If we are busy, we can reject an incoming call with a short answer, the call is automatically rejected and the Samsung device automatically sends the selected message as an SMS to the caller.

The standard short replies (quick messages) can also be edited.

Android 10 | One UI 2.0
Reject a Call with a Text message -  Wipe  Send message  up
Reject a Call with a Text message -  Choose desired  message
  1. Wipe Send message up
  2. Choose desired message

Samsung Instructions
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