Hi @Ben_siu,
You can try the following steps to get the required output:
- Read a excel file using read range activity.
- Use for each loop to get each row of a DataTable and create index variable in foreach activity.
Note: For Each Row index variable will help to identify the row throw index value. - Use while loop activity under For Each Row. In while loop put a condition so that it run 15 times. Create index variable in while also.
Note: While Loop index variable will help to identify the col throw index value. - Use If activity under the While loop and check whether the cell value is blank or not. Pass Col index variable in current row to read the cell value.
5 If the cell is blank then write the cell using write cell activity.

Regards,
Rohit