To create a rule that adjusts all price tiers on selected options, you can use the Set All Prices action. This will change all price tiers of all options that meet your conditions.
For example, if you want to offer a promo code that discounts all price tiers of a particular option by 20%, you could use the Inventory Item condition to select the option, the Promo Code condition to create the code, and the Set All Prices action to apply the 20% discount to all price tiers.
To create a rule that uses the Set All Prices action, follow these steps:
1. Navigate to Inventory > Rules in the main menu.
2. Click Create Rule.
3. Give your rule a name that's easy to recognize, and a description of what it will do.
4. Click Add New Action.
5. Click Set all prices to…
6. Select whether the rule should set, increase or decrease the included items' price points.
7. Enter the number you want to set the price points to, or the number you want to increase or decrease them by.
9. Click Create Rule.