You need to create a prerequisite first. The prerequisites that are shown in Visual Studio are in the following location
C:Program Files (x86)Microsoft SDKsWindowsv8.0ABootstrapperPackages
You can create a Product Manifest through this tutorial
Put it along with other bootstrapper packages.
Once this is done, you can select that prerequisite in your prerequisites window in publish settings and give the location from where you want the user to download it.
Here is a complete tutorial for creating Localized Bootstrapper Package.
There is a tool called Bootstrap Manifest Generator. This Code Project article is a complete tutorial for using this tool. I think this tool is not available from Microsoft directly any more.
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