Groups is one of the most popular messaging apps that are used by hosts for iPhone users' group chats. Here, We will provide the best steps for creating a contact group on Groups:
Firstly, Open your iPhone then go to the options of Groups App.
Choose the option of "Add New label."
Choose a "New Group page" and write a name for that page.
Tap on "No Contacts-Add some" for adding contacts.
After following the above steps, then choose the list of contacts that you want to add to your Contact group iPhone.
Select a name for your Contact group.
Tap Done
Source:- https://ityug247.com/how-to-create-a-group-on-iphone/