How can I set up Tiered Discounts?

You can set up tiered discounts like Buy 3 pairs of pants for $60, 5 for $90, and 8 for $120.

Live Demo:

To see how it works, please try these sample bundles:

How to create a tiered bundle:

Steps:

Visit Create Bundle page
Set up the bundle condition 1 to have at least 3 items from your pants (only 1 condition is allowed). The at least number must match with your first tier
Choose tiered discounts in discount type, input tiers in ascending order, e.g
1. Any 3 for $60
2. Any 5 for $90
3. Any 8 for $120
Fill in other parts of the form
Press the save button

Tiers in multiple ranges:

If you want to set up ranges, e.g. buy 1 - 3 items for 10% off, 4 - 6 for 15% off, 7 - 9 for 20% off. You can use the at least operator. For this case, you'll need 4 tiers:

Set up a bundle condition of at least 1 item from a collection or specific products
Set up tiers like this:
1. At least 1 for 10% off
2. At least 4 for 15% off
3. At least 7 for 20% off
4. Any 9 for 20% off (Optional)
  1. This tier is used for the maximum cap. If you don't need a cap, just set up the above 3 tiers.

Tiers + Pair with discount codes:

You can activate the option - Pair with discount codes in Tiered discounts. When this option is enabled, the tiers you set up will be used as the displayed price. If a tier is fulfilled, the customers will be directed to the cart with the discount code applied (just like discount code bundles).

Here is a sample setup:

Set up the discount codes for the tiers, let's say there are 3 tiers (Buy 2 - 4 gloves at 10% off, 5 -7 at 15% off, 8 at 20% off.
Here is a discount code for the 1st tier. You can create other discount codes similarly:
Input the bundle conditions in the create bundle page. Input the corresponding discount codes for each tier:
Press the save button and test the bundle
Individual items will be redirected to the cart with the discount code applied.

Note:

Metafield updates are slow. Please refresh the page if you find the bundle conditions not updated