Multi-Value custom fields are a new custom field type which allows you to store a delimited list of values in a single custom field. This is then parsed out and made available to become individual facet values when using this field as a facet.
There is a new “Multi-Text” Field type when creating custom field.
When editing a product with a multi-text custom field it will show up as a text area. You add one value per line and don’t need any delimited such as a comma or pipe.
You can also import and multi-text custom field values. They are treated as regular custom fields and each one is delimited by the pipe “|”.
When you add a multi-text custom field as a facet, Miva will automatically split it out into its individual values which allow you to filter on each value.