Grouping references?

First of all hello to everyone! I've been wondering if there is a possibility to group references? In my line of work I can have up to 50 different references attached to the design file and it could be quite useful for me to make a group for different types of references. (Have soilmaps be a group, infra and pipelines another, location maps another etc.) Do you have any tips on how to manage my references better? I'm using microstation v8i ss4 currently.

cheers,

KPA