Create and Message a Group in Skype for Business
Create a Group
Click the icon under the magnifying glass icon.
Choose Create a New Group and give it an appropriate name.
Add People to the Group
You can drag-and-drop people from another existing group to the new group OR
Right-click on the user and use the Copy Contact to or Move Contact to menus OR
Use the Find Someone search field to find a contact.
After you have found someone, right-click them and use the Add to Contacts List menu to place them in the preferred group.
Repeat for other users you’d like to put in your group.
Message your Entire Group
Right-click on your Group’s name and choose Send an IM - everyone in the group will get the message.