Handling Aggregate Records/Roll-up in Solr

Can someone point me to the mechanism in Sol that might allow me to roll-up or aggregate records for display. We have many items that are similar and only want to show a representative record to the user until they select that record.

As an example – We carry a polo shirt and have 15 records that represent the individual colors for that shirt. Does the query API provide anyway to rollup the records passed on a property or do we need to just flatten the representation of the shirt in the data model.