Custom Fields

To access Custom Fields settings:
Go to Omnichannel panel settings, as shown below:
Custom Fields menu appears, as shown below:
The registration form has Name, Email, and I need Help With…/Department fields by default.
To add your custom field:
Hit +New.
The New Custom Field page appears, as shown below:
Field: Enter the desired field that you want to add to your livechat registration form. E.g., last-name. It is mandatory.
Label: Enter its label. E.g., Last Name. It is mandatory.
Scope: Select scope as Visitor.
Visible: Make it visible.
Enterprise Edition Settings 
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The rest of the settings (mentioned below) are Enterprise only.
Validation: Enter Validation.
Required: Set as a required field if you want.
Type: Choose the input type (Input/Select) of the field
Default value: Set the default value, if any.
Options: Comma-separated list used to select a pre-configured value. Spaces between elements are not accepted.
Public: Set it Public. Public custom fields will be displayed in external applications, such as Livechat, etc.
Hit Save.
It is saved in the list of custom fields, as shown below:
It appears in the livechat widget, as shown below:
If the contact sends a message, it gets reflected in the Contact Information as well.
To delete a custom field:
Hit remove.