Samsung
Edit a Contact Group auf Samsung
Contact groups on Samsung phones are meant to be adjusted over time. A group you set up for a project, a family, or a club will need new members, a different name, or another ringtone sooner or later. The edit option is built into the Contacts app itself, so you never need to delete and recreate a group just to update it.
To make changes, open Tap on Contacts and go to Open the Menu. From there, select Choose a Group to pick the group you want to update, then tap Tap on Edit. This screen lets you rename the group, add or remove members, and assign a different group sound.
Once you are done, confirm with Make the desired changes and tap on Save. Changes apply immediately and affect only the selected group, not individual contact settings outside it.
If you only want to send one message or call to a subset of a group rather than change its structure permanently, selecting contacts manually is faster than editing the group.