When adding in Trading Entity details, the only required field is the entity name. The list under Entity type is created in the itris management utility, please see the Data | List Items article for more information on list items.
Once you have saved the details they will display on the applicant’s record.
When placing the relevant applicant in a contract or temporary placement you can then link the placement to their trading entity.
The linked trading entity shows on the placement record under the Additional tab. If it was not linked during the placement being created it can be linked here.