I have data like below,
| Date | Product | Sales | Forecast Sales |
| Jan-25 | Chair | 200 | 500 |
| Feb-25 | Chair | 304 | 655 |
| Mar-25 | Chair | 850 | 700 |
| Apr-25 | Chair | 0 | 800 |
| May-25 | Chair | 0 | 900 |
| Jun-25 | Chair | 0 | 855 |
| Jul-25 | Chair | 0 | 755 |
| Aug-25 | Chair | 0 | 988 |
| Sep-25 | Chair | 0 | 888 |
In sales whenever it is 0 i need to populate the previous month forecast sales value, ex for apr-25 I need to populate sales as 700(Mar-25 Forecast sales) like below, there are lot product in the product column for all this needs to be calculated in the same way.
| Date | Product | Sales |
| Jan-25 | Chair | 200 |
| Feb-25 | Chair | 304 |
| Mar-25 | Chair | 850 |
| Apr-25 | Chair | 700 |
| May-25 | Chair | 800 |
| Jun-25 | Chair | 900 |
| Jul-25 | Chair | 855 |
| Aug-25 | Chair | 755 |
| Sep-25 | Chair | 988 |
How to do this in alteryx?