We ship domestic with USPS. We'd like to offer FREE USPS First Class, but charge for USPS Priority Mail.
How can I do this with Calculated rates? It wants the same discount for all the services.
Things I've tried:
1) If I make USPS First Class or Priority a non-calculated service (e.g. price-based), it does not list the transit time.
2) I cannot make another shipping zone with the same locations.
Doing this directly may not be possible as you rightly pointed out that carrier calculated rates have a single place from where you can adjust the price. There is no way to adjust the cost of each service. However, using the Multi Carrier Shipping label app, you can adjust the cost of each service such that Priority can be displayed with 30% discount and First class is Free. Moreover, once you start using the app, the team can quickly introduce the delivery estimate feature.