data driven testcases

HI i have seen below tutorial

 

but in this tutorial its mentioned to create variable name in testcases same as mentioned in test script,

i created as per mentioned steps , added bot test case and testscript in Test suite and then execute script.

DO i have to make any changes in test cases also?

That’s outdated guide. You should read this one instead: https://docs.katalon.com/display/KD/Execute+a+test+suite#Executeatestsuite-DataforTestExecution

For your current question: you don’t need to make any changes in the test case, just need to create variables for it.