Calculation based on cells a specified number of rows apart

Hi all,

Apologies if this has been covered previously - I'm not sure exactly what terms to search on.

I want a formula that says 'subtract value in cell A10 from the value in a cell n rows higher up the column.

Where n is specified in a cell - so that it can be changed as required

eg attachedsample rise calc.xlsx

thanks in advance

Thanks so much - that is what I was after

knew there was a function - hadn't used it for years and couldn't recall what it was called

I really appreciate this "kindness of strangers" - thanks again from Australia