I have Data Like below
| Col A | Col B | Year | JAN | FEB | MAR | APR | MAY |
| Chair | Office | 2021 | 10 | 20 | 30 | 40 | 50 |
| Chair | Office | 2022 | 30 | 40 | 50 | 60 | 70 |
| Pencil | Library | 2021 | 15 | 25 | 35 | 45 | 55 |
| Pencil | Library | 2022 | 25 | 35 | 45 | 55 | 65 |
And I want the output like below
| Col A | Col B | Date | Value |
| Chair | Office | Jan-2021 | 10 |
| Chair | Office | Feb-2021 | 20 |
| Chair | Office | Mar-2021 | 30 |
| Chair | Office | Apr-2021 | 40 |
| Chair | Office | Mar-2021 | 50 |
| Chair | Office | May-2021 | 60 |
help me in achieving this