It's not working because you didn't install it anywhere, at least I couldn't find it in any of your sheet modules.
I added it INTO the Sheet1 module, and changed the code to:
You can install this into any other sheet as is and it would work the same, and it must go INTO the sheet module.
I also trimmed down your other macros, removed all the "selecting" and simply addressed the commands directly to the cells in question. For example:
You had separate CLEAR_FIELDS macros for 3 different sheets that all did the same thing. No need for that, so I made one macro and attached the button in each sheet to the same macro.
Take a look.
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