Setting Up Catch-Up Contributions as a Separate Plan

Does anyone have any experience or recommendations with regard to setting up a separate plan in Lawson for Catch-Up Contributions?  We are currently administering catch-ups in BSI.  But we are finding that BSI enforces the combined limit of $55k even for our catch up population.  So we are considering setting up a separate Catch-up plan, not subject to the same limit schedule.  This will hopefully allow our participants to reach the $55k limit plus the $6k catch-up.