In this article, we can add more options to a field by uploading a CSV file of all the values. This is very useful since we can add these to a CSV and upload them in bulk instead of one by one manually.
From the Dashboard, click on CRM and select Lead Layouts & Fields from the drop down.
In the Manage Layout Section, click on Fields Tab.
Scroll down, look for the Select Field and click on Edit.
Select the .csv file and click on Upload.
Select the values for the Name and Value then click on Upload.
The options will be added to the Options List.