When you add a meal to a proposal via Select Meals, the Available Portions pop-up has a Choose which event category dropdown listing your categories; pick one before saving the portion selection. Meals are then shown under their category with a coloured badge. Once the proposal has a delivery method set and at least one meal has a category, a Timetable card appears where you can enter a start time for each category used (for example Cocktail Hour 5:00 PM, Dinner 7:00 PM). Those times are saved with the proposal (except when the delivery method is set to Invoicing) and printed on the BEO next to each section as Starting At.