Custom field text type in the form and change in dropdown in the search

I'm using osclass 8.3 and I've created additional fields. For example, I created the additional brand field and set it as a text field. In the entry form, we have a text box where the user can enter the brand.

However, in the search filters on the left bar when viewing all listings, the field is a text field. I'd like the search filters to be a dropdown field where you can choose from all the brands entered and present in the database.

Is this possible? Even by purchasing a plugin for this purpose?

If you talking about custom fields, then you need to change type of that field.

Yes, I'm referring to custom fields.

I created the custom field, but if I create it as a dropdown, both in the data entry form and in the search filters, the field is a dropdown type.

If I create the custom field as a text field, both in the data entry form and in the search filters, the field is a text type.

I want to create a custom field that is a text type in the data entry form, but a dropdown type in the search filters. In this case, the dropdown field must have the values ​​present in the database.

How do I do this?

Custom fields does not provide such functionality.

Are there any plugins that allow you to do this?

Check these 2:
https://osclasspoint.com/osclass-plugins/attributes-fields-maps/ultimate-attributes-pro-plugin-i207
https://osclasspoint.com/osclass-plugins/attributes-fields-maps/attributes-osclass-plugin-i77