In general you can create a custom macro which will return true or false. In the code of the custom macro you can check the values of multiple fields...but the depending fields always work 1 to 1 field only. If you need to make it more complicated and compare more fields, more combinations I would rather recommend creating a custom form control which will consist of multiple fields - the fields you need and then in the code behind you can easily control and manage values in all the fields.