Create custom data attribute for Sitecore 9 Form Field Sitecore Forms provides you default form field like Text, Single-line text, Multi-line text, Email, Telephone, Checkbox except this it is very easy to create our custom Sitecore form field and custom Sitecore form field attribute. In this blog, we are going to discuss how to create custom Sitecore form field attribute in existing Single-line text. Move to the location /sitecore/templates/System/Forms/Fields/Field and add CustomAttribute field with Single-Line Text Switch to Core db and go to this location /sitecore/client/Applications/FormsBuilder/Components/Layouts/PropertyGridForm/PageSettings/Common/Styling Create duplication item of CssClass and rename it with CustomAttribute Update FormLabel to Custom Attribute Add BindingConfiguration to customAttribute Now go to this location "/sitecore/client/Applications/FormsBuilder/Components/Layouts/PropertyGridForm/PageSettings/Settings/SingleLine