Creating Customer Groups in Magento2
For any type of business it is really important to satisfy the customers for the growth and success.Therefore,customer satisfaction plays an important key role.
It is important to segregate your customers according to their needs and requirement.The Magento Experts have considered this as an advantage because it expand customer satisfaction.
To create Customer Group you need to follow the following steps: 
Add New Customer Group
Login to Admin Panel click on Stores » Other Settings » Customers Group .
You will see all the listed customers.Click on the orange button “Add New Button“.
A form will appear that you need to fill correctly, give a unique group name and select a tax class from the drop down.
When done click on Save Customer Group button.