How do I transfer User-Defined filter parameters to then filter another column?

I have code below that prompts the user for a date range, and then applies that date range to filter Column A. That information is then copied to another worksheet. How do I keep the user-defined parameters applied to A, clear them from A and apply them to Column O (the letter).

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Another Question if it's not too much trouble: How do I then copy that new filtered by Column I data directly UNDER the already existing copy/pasted data in the other sheet?

This is all I have so far:

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Thanks!