A customer segment can be targeted by associating it with a cart price rule.
To target a segment with a cart price rule:
On the Admin sidebar, go to Marketing > Promotions > Cart Price Rules.
Open a new or existing rule:
Scroll down and expand the Conditions section.
Add the condition.
Click the Add to display the list of conditions. Then, choose Customer Segment.
By default, the condition is set to find a matching condition. If needed, click the matches link and change the operator to one of the following:
does not match
is one of
is not one of
To target a specific segment, click the More … link to display additional options. Then, click the Chooser to display the list of customer segments.
In the list, select the checkbox of each segment that you want to target with the condition.
Click Select to place the selected customer segments into the condition.
Complete the rest of the price rule as needed.
When complete, click Save.