I make a product list for my customers based on pricing I (like any business)
receive from my vendors. In order to calculate the price I charge my
customers I first need to create a column for prices I pay my vendors and
then my customer prices are based on formulas and markups using the Vendor
price column figures.

I know I can hide this column - but how do I hide but more importantly
protect this column so when I email my customers this product list, they are
unable to open this hiden column to see what I pay for my product? Again, I
am not trying to find out how to simply hide a column as I already know how
to do this.

Thanks!