I have a worksheet with a column indicating "Receipts," "Deliveries," "In,"
and "Out." A second column has a series of values, all positive numbers. I
need to change all the "Deliveries" and "Out" to negative values. I have
tried filtering on "Deliveries" and "Out" and then using the Paste Special
function, but when I remove the filter I find that every value has been
changed to negative, not just the filtered records.

Any suggestions on how to change just the desired values from positive to
negative?