NOTE! When exporting Products/Services only export EITHER ALL Products or ALL Services, but never mix Products AND Services when exporting IF you plan to use this export to re-import back into Daylite.

Open the Products/Services window by... Window->Products/Services.
Highlight all the products (or services) you want to export. (Remember, if you plan to use this export to re-import into Daylite, do two separate exports, one for products and the other for services... otherwise if not for Daylite, it does not matter if you mix the two).
Select File->Export->Export Visible Columns and Selected Rows to File.
Provide a file name and location.
Click Save.