Hello, there is no built-in way to import field definitions with a CSV import, but it is possible to use the Toolset Export/Import feature to accomplish something similar. The file format involved is XML, not CSV. It will require some basic understanding of XML documents and coding structures, which are more complex than a simple CSV file. The Types export feature allows you to export all the custom fields in a site. If you create a couple of field groups and create one of each field type, then export the Types fields structure, you can open the XML file produced and see the general structures involved. You could use that as a template for creating various fields manually in an XML document. You can edit these files in any simple text editing software, or a code editor like SublimeText.
The XML export/import approach probably isn't much faster for creating the fields because of the complexity involved in the XML document, but can definitely speed up the process when adding options to fields that offer multiple options. Select fields, radio fields, checkboxes groups, etc, with several dozen options might be good candidates for this approach. In this case, it's usually best to create the field with at least one option manually in wp-admin. Then export those fields using the Toolset > Export function. An XML document will be produced containing the basic structure for all the fields, including the one option you created manually. You can copy + paste nodes in the XML document to create more options for each field, then import the updated XML document to update the existing fields structures.
Example export showing options for a select field with one option:
<options>
<wpcf-fields-select-option-06c4fcf4f3156f5121f98d1b3c4f155f-1>
<title>Option title 1</title>
<value>1</value>
</wpcf-fields-select-option-06c4fcf4f3156f5121f98d1b3c4f155f-1>
<default>no-default</default>
</options>
You could add a few more options to this select field like so:
<options>
<wpcf-fields-select-option-06c4fcf4f3156f5121f98d1b3c4f155f-1>
<title>Option title 1</title>
<value>1</value>
</wpcf-fields-select-option-06c4fcf4f3156f5121f98d1b3c4f155f-1>
<wpcf-fields-select-option-2>
<title>Option title 2</title>
<value>2</value>
</wpcf-fields-select-option-2>
<wpcf-fields-select-option-3>
<title>Option title 3</title>
<value>3</value>
</wpcf-fields-select-option-3>
<wpcf-fields-select-option-4>
<title>Option title 4</title>
<value>4</value>
</wpcf-fields-select-option-4>
<wpcf-fields-select-option-5>
<title>Option title 5</title>
<value>5</value>
</wpcf-fields-select-option-5>
<default>no-default</default>
</options>
Instead of the random looking hash number used in the nodename of the exported option, I've added sequential integers to create unique nodenames, and the system will handle it. Save that XML file and import it in Toolset > Export/Import > Types tab, and you'll see the new options appear in this custom select field.
And I should also mention the Toolset Module Manager plugin, which can be used to quickly share existing Toolset structures between sites. The structures for custom fields, custom post types, and custom taxonomies can all be shared between sites using the Module Manager plugin. So if you've already created a few custom fields and you want to import those into another site without transferring all Types settings, you can create a module with just those fields and import that into your new site quickly.
