To send a message (SMS) to a group, there are different possibilities. You can either add contacts individually in the messages app or by adding a whole group. A group message can also be sent or started via the contacts app.

Android 10 (One UI 2.0)
Step 1:  Open the  Messages -App
Step 2:  Tap on  New Message
Step 3:  Tap on  Add
Step 4:  Tap on  Groups
Step 5:  Tap on desired  group
Step 6:  Tap on  All  or select desired  contacts
Step 7:  Tap on  Done
Step 8:  Enter a  messages  and tap on  Send
  1. Open the Messages-App
  2. Tap on New Message
  3. Tap on Add
  4. Tap on Groups
  5. Tap on desired group
  6. Tap on All or select desired contacts
  7. Tap on Done
  8. Enter a messages and tap on Send

Samsung Instructions
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