Use For each row in datatable activity to loop through dt1
Identify the values to be updated to DT2
Use Add data row activity for adding data row to DT2
Your code should look similar. Attaching for reference
Use For each row in datatable activity to loop through dt1
Identify the values to be updated to DT2
Use Add data row activity for adding data row to DT2
Your code should look similar. Attaching for reference