Once the trigger is created, define which process flow should run based on if/else condition criteria.
To add a condition to a process, go to the Order Processing tab to open the Process Builder.

Choose (+) below the Trigger. Select Controls and Events.

Select Condition.

To configure the condition, choose Open Condition Editor.

Process content will contain a list of attributes that have been defined in previous skills. For example: in the screenshot, you can see attributes from the API trigger. You will use this process content to configure different skills during business process modelling.
Edit your branch condition:

You have configured your if branch to: if quantity is greater than 10.
To save the Process, choose Save.