This article will teach you how to establish a new custom field with the multiple values.
The first step is to add a new custom field. Go to Listivo Panel -> Custom Fields -> Add New Field.
Write down Your field name and set the type as Taxonomy. Only this field type allows selecting the multiple values.
Find your new field on the custom fields list and edit it.
If you mark the field "Allow Multiple Values" you can add more than one field with the same value. It is allways set for multilevel option.
For example, when you add a new listing, you can add more than one feature.
For fields like Car Make, the Multiple Value is unsuitable because two of the same makes can be problematic for customers.
You can choose only one make for your listing.