OfficeTalk lets you store additional custom data with each conversation. For example, you may wish to attribute a cost to the conversation. Additional custom fields must be stored in the Conversation property sheet in a separate page. For example, you may create an additional page in the Conversation property sheet, called "Costing". The Cost field may then be added to this page. You may add any number of additional custom pages to a property sheet and you may add any number of additional fields to a custom page.
For more information on custom fields and custom dialog boxes, see The Custom Field Wizard