Changing formulae to their value
 

I have a spreadsheet that shows stockholding figures on a day to day basis. I
have a row with a date in each column for each day of the week, and in the
respective columns beneath each date i have formulae which look to a
different spreadsheet (with a date stamp), to update the information in a
number of cells in the column which the date matches. At the moment i have to
manually highlight the updated cells and convert the formulae to values, so
they don't reset to zero the following day because the date doesn't match.
Is there a way to run a macro, which will look at a range of cells in one
row, and if it comes across a cell in that range which has a figure greater
than zero, will select a set number of cells above this figure to convert the
formulae to values ?
Any help would be appreciated