Adding one to many and many to many to metadata model

Hi All, 

I would like to log one to many and many to many relationships within the metadata model at the attributes level.

For instance I would like to log the information products (like reports) which use the specific attribute for impact analysis. This results in a one to many relationship because attributes might be shown within multiple information products.

Hence, I only notice the ability to add on a one per one basis. Hope you can help me out.