You might try New-Item to create additional directories to split/move the items into, and then use Move-Item to move certain items to the folders/subfolders you create. With a million files, you'll probably want to use the -Filter parameter, of the Move-Item cmdlet, to get a subset of the files that you want to move to a particular folder.
You can use the same -Filter parameter on Get-Item, storing the results into a variable, and then dumping out the variable to make sure you will be moving the items you want to move to a particular folder/subfolder. You can then pipe the variable to the Move-Item cmdlet.
That's definitely possible, but before running a Get/Move script, with guns-a-blazing, on a million files it's good to verify that the right set of objects will be affected by the Move-Item cmdlet. If the filter can be fine-tuned enough, for a test, that would be the best thing before running the code on the full set.
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