Import Relationships from Excel Macro - Attribute Level

I've been using the Import Relationships macro to populate a logical model from an Excel config file. I have used this macro after using a tailored version of the Import Columns macro to ingest the Entities and their Attributes into ER Studio.

The problem I am having is ER Studio forms the relationships at the Entity level, and not at the attribute level. The method Add on the Relationships object only allows for 2 parameters to be passed into it. 

I am not well-versed in VB at all, so does anyone know how I would alter the Relationships macro so it formed the relationships at the attribute level? 

Thanks in advance,
OIly.