Refer to the cell via its absolute address: $B$2. That way as you
'drag/fill' formulas using it around on the sheet, it won't change.

To subtract a value from it
=$B$2 - 4
or even another cell reference
=$B$2 - D3


"AFL-math" wrote:

I am sure that this question has been asked and answered. I am creating a
worksheet for my class. I have a value in cell b2( I want use this value
thru out the sheet). Let say b2 = 10

b c d
3 5 6 8
4 3 7 1

I want to subtract each value from b2(10). How can I do this without doing
it manually?