Upload relationship cardinality using macro


I am trying to upload an excel sheet containing parent and child entities , relationship b/w them. Till this point, ERStudio has a std macro ( Import Relationships From Excel.bas ) which works ok. But additionally I want to add another column(s) which defines the cardinality of the relationship - like one to one / one to many etc. How do I do that using macro? Can anyone please help me?

Thank you.

Rgds - Jettas