Substitutes and Compliments

I am implementing SAP SRM MDM Catalog 3.0 on MDM/SRM 7.1.

I wanted to know if we can implement the substitues and compliments for a particular product or catalog item.

Substitue - If Article A can be repalced by Article B. B is substitue for A.

Compliment - If I buy Article A then I have to buy Article B. For Ex. Software is must while buying Hardware. So, B is compliment for A.

Please do provide some information about the same.

Can we achieve the same by Development. I guess MDM supports such feature in the form of Relationships.