We have done a GA release, now for a patch release I am wondering if in the same project I can use the PatchDesign option. If so can you provide any documentation or demos for doing so...
Yes, you can use the same project (or probably a copy of the project).
There's a whole "Updating Applications" section in the help that is installed with InstallShield, and that contains information to get you started. In addition, the Flexera Software Web site has some technical white papers (Building MSI Updates and Patches, Validating MSI Updates and Patches, Designing an Upgrade-Friendly MSI Installation), and these are great resources: http://www.flexerasoftware.com/resources/whitepapers.htm
