Is there any way to forbid users to see data in some
cells while the program still can use these cells for
make calculations?

The main idea is the following. I make a price list for
our distributors. There is a column with base prices
which are multiplied by a certain ratio with final prices
column as the result. Is there any solution to hide the
base prices so the end users won't be ever able to
discover them?

Michael.