Disclaimer: This article is for Lunchbox 2 Enterprise customers only. If your dashboard header looks the same as below, you are in the right place:

You have the ability to send orders to different destinations in the POS based on Service Type. To enter an external ID that will apply to all locations (chain-wide), you will need to contact your LunchBox customers success rep. However, users with Chain Admin access have the ability to update the local external ID. To update the local service type external ID for a specific location, you will first need to have the IDs from your POS and then enter those external IDs under the appropriate Service Types: