How can we display data based on some specific column using dropdown?

We have an excel sheet that contains 5 columns, It has four categories and each categories have different products. I am using Dropdown for displaying Categories the data is displaying but i want to display only those that are in the selected category. 
1 answers

In the reference selector properties got to Selectable objects tab, select source as XPath, then add Xpath constraint or you can use Constrained by option and select the path.

You can also set Source as Microflow and filter desired objects in the microflow to display.