In reply to Tracy Heung.

Great! In case you would need a solution for SAS Visual Analytics, there is the Hidden data role for a Scatter Plot object that "specifies a category or date data item that is included in the data query without it being displayed. You can use the hidden data item when you map data sources, add color-mapped display rules, or add external links. For more information, see Understanding the Hidden Data Role in SAS Visual Analytics: Working with Report Data."