Is your question is like
You have a dashboard where you connected to Teradata multiple times(Say four times) each time with a different CutomSQL script.
All your datasources are embedded within the workbook and are of Extract data connection type. Now, if you refresh the workbook
will the 4 scripts run sequentially or concurrently? is that right?
I can confirm that all 4 customSQL/Scripts you have in your dashboard will run concurrently during your extract refresh.