There is no limit on groups, so separate menus are just separate groups: “Breakfast”, “Lunch”, “Dinner”, “Weekend brunch”.
Say the serving times in the Group Description — “Served 8am to 11.30am” — since groups do not have times of their own.
A worked example
- Group: Breakfast — description “Served 8am to 11.30am”
- Group: Lunch — description “Served 12pm to 4pm”
- Group: Dinner — description “From 5pm”
- Group: Drinks — no times needed
Because groups have no times of their own, the group description is where the serving window belongs. Put it there and nobody has to ring to ask.