Hi,

thank you for your question. Yes, you can add relationships between attributes. This specific example is covered by our documentation: https://docs.ataccama.com/one/latest/metadata-model/custom-relationships.html 

You can also built relatinships between different entitites, there is a community article that covers that as well: 

 The principles are very similar.

Please let me know if this helps.

Kind regards,

Anna