Huawei Mate 9 - Manual (Page 119)

2
Touch Groups and select which group you want to send a message or email to.
3
Touch to send a message or to send an email.
Deleting a group
1
Open Contacts.
2
Touch Groups.
3
Touch and hold the group you want to delete, and then touch Delete.
4
Touch Delete.
Deleting a group will not remove the contacts in the group from your phone.
Calls and Contacts
113