If you ship a mix of smaller and bulky/heavy products, you can create rules to allocate a certain carrier to orders with bulky/heavy products.
In this example, we'll create a rule to ensure Allied Express is allocated to orders with a dead weight greater than 25 kg.
Switch on Allied Express in your Carrier Settings.
Select 'Cheapest' in your Allocation Settings.
Create a new rule and add a condition for when the dead weight is greater than 25kg.
Add the action, do not allocate and select all couriers except Allied Express.
Click on save and enable the rule. Make sure you enable the rule so that new orders will have the rule applied.
To learn more, check out our other support articles on the Rules Engine.