Hi Selvakumar,
1.Create a new variable
2.For concat use below expression
“trim($EntityName/Value1) + ' ' + trim($$EntityName/Value2)”
3.Assignee new value to new variable
For members referring this in future, please don’t add “” it may show you error.
Add your Action value just like below:
trim($Entity/Text1)+''+trim($Entity/Text2)+''+trim($Entity/Text3)+''+trim($Entity/Text4)