How to start the autofill option from a cell in excell

I have a field(cell): P2 and when I type 25 I need that value to be copied to cell B53 and from this cell B53 to start autofilling and increasing the value when cell C46 is not empty anymore. Let me explain that again : So when I put a value to P2 that should be copied to B53. After that when I fill cell C46 the cell B54 would be the increased value from cell B53

Example: I put 25 in cell P2...Then cell B53 become 25...Then I put something in cell C46 so the cell B54 is autofilled with value 26.

Thanks for your help. And do not hesitate to ask any questions that you have.

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