Excel Month Sequences and auto population...the main cell information is a data validation dropdown

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Hello, please bear with me as I try to explain this...
I am trying to copy the formula from a protected spreadsheet, and it has 2 main cells (darker shade of green) that can be edited (one for the year, manual text input) and (one for the month, a dropdown input).

 

When selecting the month, the below cells auto populate with the sequential months, in reverse.  So if December is selected, then November, October, September, etc... populates automatically.

DuuoPro_0-1628031174017.png

Same thing when changing the cell for the year (2021). 

See below same selected month, just changing the year to 1997

DuuoPro_1-1628031532855.png

 

Anyone can help figure out how I can make this same chart on my own?

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