How do I set a customer's delivery schedule?

"Delivery schedule" is set in two places, depending on whether it's for one customer or many:

1. For a single customer (the main way). Open the customer (Customers → Customer List → the customer → Freight tab) and edit their delivery schedule there.
2. For a group of customers. Use a freight rule (Company Profile & Settings → Freight Rules → edit a rule → Advanced scheduling), turn on Custom Day Overrides to choose which days delivery is available, and set a Delivery Day Buffer. Apply that rule to every customer who should share the schedule.