Copying Multiple Charts from Excel to PowerPoint

I am relatively new to vba and is running into some issues with copying and pasting charts from varios tabs (approx 30) from excel each ti its own slide in powerpoint. Herein lies the issue - the ranges for each of those charts differ and I would like to be able to customize this range based on additional tabs with charts being requested in the future.
So far the code I have is:

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Any help is greatly appreciated.