From the sidebar, go to Manufacturing (a Management-role screen). The route builder is the Workflow Architect panel. Give it a Process Routing Name — the only required field — and an optional description.

Batch Size defaults to 1 and covers the common case — one unit in, one unit out, durations scale with however many you're making. Change it only when a single production run genuinely produces more than one unit at once.

Under Sequence Stages, click + Add Stage for each step in the process. Every stage needs an activity name and where it happens — a specific station, any station tagged with a given work type (so whichever's free can pick it up), or sent out to a subcontractor entirely. Set how long it takes and whether that duration is per unit (scales with order quantity) or per batch (fixed, regardless of how many units are in the run) — and how many staff it needs, since a two-person lift takes twice the labour cost of a one-person step even at the same duration.

Save Workflow Template adds it to your list of existing templates, ready to reuse across as many products as need the same process. A route on its own doesn't do anything yet — it only starts driving real orders once it's picked as the Manufacturing Route on a product's Bill of Materials.