A scenario goes along with a data set. Scenario Outline is concrete examples of different data values. Open a scenario detail and select Add new data set

Enter a header for the dataset. 

Scenario outline can have many headers.

then click Add data set to input value for each header

Scenario outline is added at the end of each scenario

Each of dataset will be looped through when running automation test. 

To use the data in scenario outline, refer to section parameterize a step definition