Christina wants to mark up rates with a handling fee
Christina has already:
Navigated to her Postcode Shipping dashboard.
Add a handling fee/rate adjustment:
From the Shopify dashboard click Settings > Shipping and delivery.
Click Manage Rates next to the shipping profile you wish to edit.
Scroll down to the 'Shipping to' section.
Expand the 3 dots to the right of the rate you wish to add the handling free to, and choose Edit.
In the rate edit window, under 'Handling fee', you can add a positive or negative rate adjustment by percentage or as a flat rate.
Click Done when you are ready.
Now Christina's customers' overall total will be adjusted with the additional handling fee, as long as their delivery address is in the Shipping Zone she applied the adjustment to. Be sure to apply the fee to all Rates in all Shipping Zones that need it.
The handling fee is added to the total shipping rate that the customer sees, and is not displayed separately. So a $30 shipping rate with a $2 handling fee will show to the customer simply at a $32 shipping rate.
If you'd like to add a handling fee to a more precise area than a whole Shipping Zone, we recommend you build the fee into your Rates.