Reserve parts for upcoming job — how to?

Hey all — running into a situation where I've got a big install job coming up next week and need to make sure the parts don't get grabbed by someone else for a different job. I know there's a reservation feature in the inventory module but I've never actually used it. Is it just a matter of flagging items against the work order, or is there a separate process? Also does it actually hold the stock or is it more of a soft reservation that someone could still override?

Pro tip from the field: if you're doing multi-day jobs, definitely get familiar with this. Nothing worse than showing up day 2 and finding out your thermostat got used on an emergency call.