Theoretically, you can convert almost any type to DynamicType and then add custom fields to it, so it might be possible for Taxon(the base class from which or classifications derive) as well. For example:
var metaManager = Telerik.Sitefinity.Data.Metadata.MetadataManager.GetManager();
Please execute this code only once, and do not forget to back up your database beforehand. I've tested it on my local project and was able to programatically store and later retrieve data from the field, and the category was still usable in Sitefinity, however we have not tested this functionality thoroughly so I'd advice you to be cautious.
You can operate with your new field using our extension methods GetValue() and SetValue() like this:
var manager = TaxonomyManager.GetManager();
var myCat = manager.GetTaxa<HierarchicalTaxon>().Where(t => t.Name ==
var testValue =
"Some value 1111"
Please do not hesitate to let me know if y9ou need any additional information or any further assistance. It was a pleasure for me to help you on this issue.
the Telerik team
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