Hi
I'm trying to build a simple forecast model based on certain categories. In addition, I want to be able to update this dynamically on a monthly basis.
Data
| Stage | Start Date | Leave Date | Jan-20 | Feb-20 | Mar-20 | Apr-20 | May-20 | Jun-20 | Jul-20 | Aug-20 | Sep-20 | Oct-20 | Nov-20 | Dec-20 |
| Actuals 1 | N/A | N/A | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | | | |
| Actuals 2 | N/A | N/A | | | | 1 | 1 | 1 | 1 | 1 | 1 | | | |
| Actuals 3 | N/A | N/A | | | 1 | 1 | 1 | 1 | 1 | 1 | 1 | | | |
| Actuals 4 | N/A | N/A | | | | | | | | | 1 | | | |
| Known Joiner | 10/15/2020 | N/A | | | | | | | | | | 1 | | |
| Known Leaver | 10/31/2020 | | | | | | | | | | | -1 | | |
| Open Role 1 | 10/15/2020 | | | | | | | | | | | | | |
| Open Role 2 | 11/20/2020 | | | | | | | | | | | | | |
Desired Output
| Stage | Start Date | Leave Date | Jan-20 | Feb-20 | Mar-20 | Apr-20 | May-20 | Jun-20 | Jul-20 | Aug-20 | Sep-20 | Oct-20 | Nov-20 | Dec-20 |
| Actuals 1 | N/A | N/A | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 |
| Actuals 2 | N/A | N/A | | | | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 |
| Actuals 3 | N/A | N/A | | | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 |
| Actuals 4 | N/A | N/A | | | | | | | | | 1 | 1 | 1 | 1 |
| Known Joiner | 10/15/2020 | N/A | | | | | | | | | | 1 | 1 | 1 |
| Known Leaver | 10/31/2020 | | | | | | | | | | | -1 | -1 | -1 |
| Open Role 1 | 10/15/2020 | | | | | | | | | | | 1 | 1 | 1 |
| Open Role 2 | 11/20/2020 | | | | | | | | | | | | 1 | 1 |