Tags are additional keyword for you to classify and analyze leads, opportunities and sales.
Tags are found in Lead, Opporunity and Quotation forms. Multiple tags can be added to the same form.
Once a tag is added, you can make use of the search function to filter the list based on tags.
Please refer to Search for more information.
Go Sales -> Configuration -> Leads & Opportunities -> Sales Tags
To create a new Sales Tags, simply click on and enter the new sales tag name.