Is there any proper way to store all the above informations on SDP?

At the moment we use Assets for people, but this is not the greatest idea.

For instance if someone has 3 different domains, and some another accounts on different systems, we would like to attach all this information on the SDP so if you click on the person name it will show all the accounts associated to the user as well as all the assets such as mobile, workstation and etc.

Regards

Mario