Go through the following steps to add a group:
1. Click on the Add group option in the top left corner.
2. Type the group name you wish to choose and press ENTER.
3. You may add contacts individually by filling in the details or by directly importing a CSV file of your stored contacts.
Also, there is no limit on importing contacts. You may import any number of contacts in one go.
NOTE: The only restriction is that the file size should be limited to 20 MB.