Hi @stetra24 , Josiah here.
I run a preorder app (Early Bird) and often get enquires about mixed cart shipping costs - though I find yours a bit different to the enquiries we usually get!
I want to make sure I understand your question correctly:
My first interpretation: Currently if a customer places a mixed cart order (shopping basket), they’re being charged several times due to having multiple deliveries. And you’d like to charge them for freight only once (or free if their order is over 80 Euros). You’ll pay for the freight of their multiple deliveries?
If this is the case, you might want to check if Shopify has auto-enabled the Split shipping in Checkout feature for your store. (Check under Settings > Shipping & Delivery > Shipping). At the bottom of the Shipping section, it should display Split shipping (On) - Show products from different profiles or locations as separate shipments in checkout.
Turning this feature off should only show one shipping cost in your customer’s checkout and charge them for freight only once - unless their items are being shipped from two different fulfillment locations (which would then show two, I think). In your Orders Admin it could still be two sub-orders (split fulfillment) since you’re using a pre-order app/add-on. You’d have to pay for their freight once when you’re shipping their in-stock item, and pay for their freight again when you’re shipping their pre-order item.
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My second interpretation: Currently if a customer places a mixed cart order (shopping basket), they only pay for their freight once (or free if their order is over 80 Euros), but you’re being charged for freight twice. Once to ship their in-stock item and once again when shipping their pre-order item. This obviously eats into your margins, so you’d like to only be charged once.
If this is the case, you might want to check if you can Shopify has auto-enabled the Split shipping in Checkout feature for your store. (Check under Settings > Shipping & Delivery > Shipping). At the bottom of the Shipping section, it should display Split shipping (On) - Show products from different profiles or locations as separate shipments in checkout.
Turning this feature off should only show one combined order at checkout to your customer and charge them for freight only once - unless their items are being shipped from two different fulfillment locations. In your Orders Admin it should be two sub-orders (split fulfillment). You’d have to pay for their freight once when you’re shipping their in-stock item, and pay for their freight again when you’re shipping their pre-order item.
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There’s also an alternative - have you considered telling your customers if they have a mixed basket, their in-stock item(s) will be put on hold to be shipped together with the pre-order item(s)? This way you can only charge your customers once and you only need to pay for one freight cost.
You can then manually go into each order to put the in-stock fulfillment(s) on hold, or use Shopify Flow to automate holding all fulfillments to ship together. Something like Order Created > Check if there’s at least one pre-order item and one in-stock item > Hold fulfillment with the following note: (insert whatever info here).
It’s all about setting clear expectations - mention this in your newsletter and socials when talking about the pre-order items, include the info on your pre-order product pages, add a pre-order section in your shipping policy, edit your order confirmation email, add another email to your post-purchase flow etc.
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There might also be another more straightforward method without using Shopify’s Split Shipping in Checkout feature at all: Add all your preorder items to a new shipping profile and set the shipping cost as $0. Now you have your existing shipping profile for in-stock items and charging your customers the usual freight costs, and a new shipping profile for pre-order items charging your customers zero freight costs. This doesn’t work for my second interpretation and you mentioned you only offer free shipping if their cart value is over 80 Euros, hence I didn’t suggest this at the start.
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Happy to chat further and see if I can work this out (always learning about what merchants are looking for their preorder operations). 