Hello, I am trying to build a base for our vehicles and equipment fleet. This base will hold the maintenance log and the maintenance service schedule for each vehicle. I am stuck with how to move forward in the set up process. I initially started with three tables, Vehicles/Equipment, Maintenance Log, and Maintenance Schedule. I want to be able to plug in formulas that will calculate the next service dates for various types of services (oil changes, fluid checks, tire rotation, etc.) but because we are working with all different types of equipment (heavy duty, UTVs, cars, tractors) I am having a hard time finding a way to systematically implement the same formulas for each piece of equipment. I want this to be easy to maintain for the user and not too complicated, but I am having a hard time figuring out how to link dates versus mileage. I hope this makes sense, but I would love some advice for how to even set up each table and what my primary fields should be for each, I've included snap shots of each table so far. I've added and deleted about four different formulas so far, that have worked but aren't exactly what I want. Any advice welcome!