Global Variables and Contexts - Getting Started with Talend Open Studio for Data Integration - page 235

11. We don't need the Default context, so click on the checkbox next to the Test
context (to make it the default context for the job) and then click on Default
and the Remove button to delete it. You should now be left with
two contexts, Test and Production .
12. Click on OK to close the window.
13. Returning to the Value as table window, you can now see two new
columns— Production and Test —added to the window. We can now
enter variable values for each of these contexts.