To add a promotion on several prices, go to the Articles module. Select the prices on which you wish to add a promotion. Once selected, the items will be highlighted in "yellow", as shown below.
You can then click on the Add a promotion button on the right :
Once you've clicked on the Add a promotion button, this window appears :
As in the example below, you will need to complete the following fields :
- Promotion title
- Discount to be applied
- Expression (how you want to apply it)
- Start date (promotion start date)
- End date (promotion end date)
- Active (Must be active or not)
then Save to apply the promotion :