Even after you create a group, you can still add contacts afterwards.

Android 10 (ColorOS 7.0)
Step 1:  Open the  Contacts -App
Step 2:  Open the  Menu
Step 3:  Tap on  My Groups
Step 4:  Tap on  Group  you want
Step 5:  Tap on  Add
Step 6:  Select all  Contacts  you want
Step 7:  Tap on  Add
  1. Open the Contacts-App
  2. Open the Menu
  3. Tap on My Groups
  4. Tap on Group you want
  5. Tap on Add
  6. Select all Contacts you want
  7. Tap on Add

Oppo Instructions
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