Reading all the values in the next rows of a same column

Hi Geeks,

I need to subtarct the value of a column with the all the values of next rows.

Eg: Say i have a column TRXS, and the values are


Row 1 4
Row 2 5
Row 3 2
Row 4 3

I need to subtract the value of Row 1 TRXS with all the values of remaing rows ,

Can you pl suggest any idea for this?

Thanks in advance