Catamaran tour reservations system - repost

need a custom access database reservation system that will allow client to add and edit reservations from multiple vendors at multiple prices and track commissions while being able to see daily booking snapshots. Client has 2 boats and runs 2 excursions per day per boat. Client also needs ability to book long term private charters. Numerous other pieces of info including billing are needed. This is a closed non internet system designed for 2 computers in a small office. I have flow sheets with variables and a background in relational database design but am too busy to do myself.