Samsung SMT-i5343 User Manual page 158

Add Group
After selecting a device, just as contacts, you can enter its name and select
members.
Add Group Select location to save
Enter name
Add Member
Find Contact
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Function Description
Select Deskphone or Smartphone.
Enter a group name. (If it is duplicate,
there will be a warning popup.)
Moves to the member selection screen.
You can search a contact using an
entered keyword.