Group Sum Sudoku (Mini Sudoku Series #22)

Group Sum Sudoku is a very interesting Mathematical Sudoku variation. Even though this Sudoku is not appearing in Sudoku Mahabharat Math Variations Episode 5, but I thought that let me create this Math Variation just for fun. This Sudoku variation is one of the most feared Sudoku types and it uses the knowledge of the sum of numbers in the 3x3 box as 45 in the case of 9x9 Sudoku and the sum of numbers in the 2x3 box as 21 in the case of 6x6 Sudoku.
The current puzzle is a very interesting puzzle and this is my second Group Sum Sudoku puzzle. My earlier puzzle is posted under the title Group Sum Sudoku (Daily Sudoku League #44).

I am posting this Group Sum Sudoku as 22nd Sudoku in Mini Sudoku Series. Can you solve this Group Sum Sudoku puzzle?

Rules of Group Sum Sudoku

Mini Classic Sudoku Rules apply. Additionally, the number in each circle indicates the sum of the digits in the cells covered by the corresponding circle.