1. If you choose append, the values from the sheet will be added to the existing tags in the record.
   
2. If you choose replace, the values from the sheet will be replacing the existing tags in the record

Tag records added via a web form

Web forms is where you capture data about your website visitors and sync those data in your CRM account. You might have multiple web forms in your account, such as a contact us form, a landing page, or a sign in form. Adding tags to records through each web form will help you filter them in a better way. You can perform a global search or use advanced filters to list records that are captured from the respective web form. See alsoSetup Web Forms

To add tags while creating a web form,

1. Go to Setup > Marketplace> Web Forms.
   
2. You will have an option to Add Tags, while creating a webform. Add Tags based on your requirements and click Save.
   
   The relevant tags will be added and associated to the records created via the related web forms.

Automate tagging records (using workflows)

In Zoho CRM, Workflow Rules are a set of actions such as alerts, tasks and field updates, which will be executed when certain specific conditions are met. See more about creating workflow rules here.

You can add tag as an Instant Action while creating workflow rules in Zoho CRM. For example, if you're setting up a Big deal alert rule, you can create an action to add tags like bigdeal, hotdeal, probability100%, etc., Whenever the workflow rule is executed with the specified criteria, the respective tags will be added to the record automatically. Please note that, the tags will be added only till the maximum limit allowed and if there are existing tags, new tags can be added only till the specified limit (See tag limits).

To set tag as an instant action, do the following:

1. Go to Setup > Automation > Workflow Rules.
   
2. In the Workflow Rules page, click on the rule for which you want to create an instant action.
   
3. Click Edit to modify the rule settings.
   
4. Under Instant Actions section, choose Tag and add the required tags to be associated with the workflow rule
   
   Whenever the rule criteria is met, the relevant tags will be associated to the records automatically.

Blueprint in Zoho CRM is an online replica of your offline business process. It helps you to automate routine actions and guide your team members through the entire execution of your business process. Read more about Blueprint here.

While designing your blueprint, you can define actions to be automated at the completion of your transition. These actions will be automatically executed when specified criteria is met. Learn more about blueprint transition settings here.

You can add tags as one of the actions to be automated in your business process.

For example, a "qualified" tag can be defined in the transition for a deal in qualification stage.

Whenever a deal is in qualification stage, the relevant tags will be associated to the deal record automatically.

Please note that, you can add tags will be added only till the maximum limit allowed and if there are existing tags, new tags can be added only till the specified limit (See tag limits).

Note
While adding tags to your records in CRM, you can choose to overwrite the existing tags with new tags. For example, you may require to add a set of relevant tags for particular actions through workflows. If there are few existing tags and are not relevant to that particular action, you can overwrite them with new tags, if necessary. Overwriting tags will replace all the existing tags with the newly updated tags.

Also, you can overwrite tags only while adding them via blueprint, workflows and to multiple records.