Step1:- Click create contact.

Step2:- Select the option create a contact and add contacts one by one.

Step3:- Use a bulk import contact and select your  CSV file.

Step4:-  After the import, you can check the added contact.

Step5:- Click Manage labels and choose one of the existing labels or create a new one.

NOTE:- [ Create a message there are two you can create a ulk email in Gmail.]

1. Google Contacts

2. In Gmail.