Assign values to dropdown menu selections

Hello,


I have a dropdown menu in cell A9 with 5 selections in it. I want 4 of the selections to have cells automatically populate when they are selected (I have embedded IF statements into the cells that I want to change). However, I want to have one of the selections in the dropdown menu be an "open" selection, where I can enter in my own values in the same cells that would be populated if one of the other 4 selections were picked.

Does anybody know how I can tell the IF statement to allow me to input my own data when the "open" selection is chosen, while still re-populating the fields when the other 4 selections are picked?

Unfortunately, I can't upload an example because there is private information that I can't share. If you want me to clarify anything, please let me know!

Thanks!