I do my Estimates with Quick Books. I either print out my Estimates or email them to my customers.
When I need to make changes to an existing Estimate, I make the changes on the same Estimate with a note at the bottom saying "Revised 7-13-10".
For example, I quote a sofa, and then I add two club chairs to the original Estimate.
Is this the way you do it? Or, is it better to provide a totally new Estimate.
Thank you,
Gene