Set up a rule set
A rule set is your organisation's routing configuration. One is active at a time, and it decides which site fulfils each order line.
Add a routing rule
Rules narrow the candidate sites for a line. Each one filters what the rule above it left.
Choose a fallback site
The fallback site is where a line goes when no eligible site has stock for it. A rule set cannot be activated without one.
Resolve a routing exception
An exception records that a channel supplied a location hint, the channel is set to honour hints, and your rules would have chosen differently.
Change an order's fulfilment site
Routing runs once, when the order arrives or when a draft is confirmed. Changing the result afterwards is possible in specific ways, and not in others.