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The Quantity Break block can show its own price on each tier, so a “buy 2” option can advertise a bundle price instead of twice the unit price.
Custom pricing changes what the page shows, not what Shopify charges. Setting a tier to £49.99 makes the block display £49.99. The cart still charges the product’s real price times the quantity, so two items at £29.99 arrive as £59.98.Shopify decides every price. A storefront can never send one. To make the cart agree, create a matching discount in Shopify admin.
This is the most common surprise with quantity breaks: the product page and the cart disagree, and nothing in the theme is broken.

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Turn custom pricing on

Custom pricing is off by default and has two switches, a global one and one per tier.
1

Enable it for the block

In the Quantity Break block, turn on Enable Custom Pricing.
2

Choose the format

Set Selected custom price format. This applies to every tier in the block.
3

Enable and fill each tier

Turn on Enable Option 1 Custom Price and enter the value, then repeat for the tiers you want. A tier without its own switch on keeps the normal price.

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The three formats

Amount is a total, not a unit price. On a “buy 2” tier, entering 49.99 displays £49.99 for both items together. Entering the per-item price you wanted is the usual cause of a tier showing half what you expected.

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Make the cart match

Whatever you display, create the equivalent discount in Shopify so the customer is actually charged it.
1

Work out the real discount

Compare the normal total against your displayed price. Two items at £29.99 is £59.98; showing £49.99 is £9.99 off, or roughly 16.6%.
2

Create an automatic discount

In Shopify admin go to Discounts → Create discount → Amount off products, and set the method to Automatic so the customer does not have to type a code.
3

Scope it to the product

Under Applies to, select the specific product. Under minimum requirements, set the minimum quantity to match the tier, so a “buy 2” discount only applies from 2 items.
4

Test it

Add the tier to the cart and check the total. The cart, not the product page, is the number the customer pays.
Set the minimum quantity on the discount. Without it, a discount meant for the “buy 2” tier also applies to a single item, and every customer gets bundle pricing.

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Multiple tiers

Each tier needs its own discount, because the saving differs per tier. A three tier block usually means three automatic discounts, each with its own minimum quantity. Shopify applies the best matching discount, so scope them by quantity and let them stack in order: minimum 2 for the second tier, minimum 3 for the third, and so on.

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Troubleshooting

Expected until a discount exists. The block displays your figure; Shopify charges the real price. Create the automatic discount described above.
In Amount format the value is the total for that tier, not the per unit price. On a “buy 3” tier, entering the single unit price displays a third of what you intended.
Both switches have to be on: Enable Custom Pricing for the block, and Enable Option N Custom Price for that tier. The per tier switch is off by default.
The discount has no minimum quantity. Edit it in Shopify admin and set the minimum to match the tier it belongs to.
Percentage format calculates from the base price and rounds, so a percentage rarely lands on a round figure. Use Amount when you need an exact price such as 49.99.

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The savings line and multiple currencies

Each tier can show a savings line under it, such as “You save $26”. How you write that line decides whether it survives a currency change. The {savings} placeholder is replaced with the real figure at page load, formatted for the active market. Type a number in yourself and it is plain text, so a store selling in four currencies shows the same amount to all four.
This bites when you turn on per tier savings text. Enable individual savings text lets you write a line for each tier, and it is tempting to type the amount. Keep {savings} in the text and add words around it instead, for example Save {savings} on this bundle.
The default format is You save {savings}, so a store that never touches these settings is already correct. The savings badge is calculated separately and updates as the customer switches variants.
Free gifts work the same way: the theme marks an item as free, Shopify has to be told to charge zero for it. See Free gifts.