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SUBMIT YOUR IDEAThe factory tools simplify this exercise significantly by performing a specialized batch macro.
Regarding the inputs, in this very special case, all the spreadsheets have the same sheet names and formats so you can pull in all of them at once without a macro.
For practicality, I'd suggest splitting the data prep from the time series analysis. Once you have the data ready, there's no need to recreate it on each workflow run.
Note: the original xlsx files aren't included in the zip file as the Export function in Alteryx doesn't find the dynamically chosen files.