Cobalt CCK for Joomla Expert Needed

We are looking for a developer expert familiar with Cobalt CCK extension for Joomla. We need to build a special Cobalt CCK "field" similar to "Multifield" module available for Drupal. Drupal "Multifield" module functionality explained [login to view URL] Drupal "Multifield" module official link [login to view URL] Needed functionality - Ability to define fields "groups/collections" inside Cobalt - For each fields "collection" we will assign some Cobalt fields - A particular fields "collection" will be assigned to a Cobalt listing type In Cobalt submission form those fields "group" can be multiplied on-the-fly by the user (check the above link for functionality example for Drupal) It's basically somekind of "placeholders" that will contain Cobalt fields and those "placeholders" will be assigned to listing types. Looking forward for your bids ! Thanks in advance !