I'm using heat.exe to generate fragments similar to this:

<Fragment>
  <DirectoryRef Id="INSTALLDIR">
    <Component Id="id1" Guid="*">
      <File Id="fid1" KeyPath="yes" Source="SourceDir\Foo1.dll" />
    </Component>
    <Component Id="id2" Guid="*">
      <File Id="fid2" KeyPath="yes" Source="SourceDir\Foo2.dll" />
    </Component>
    <Component Id="id3" Guid="*">
      <File Id="fid3" KeyPath="yes" Source="SourceDir\Bar.exe" />
    </Component>
  </DirectoryRef>
</Fragment>

<Fragment>
    <ComponentGroup Id="Components">
        <ComponentRef Id="id1" />
        <ComponentRef Id="id2" />
        <ComponentRef Id="id3" />
    </ComponentGroup>
</Fragment>

These fragments are stored in the auto-generated wxs file.

I'm then adding them into my feature (in the main WiX file) like so:

<ComponentGroupRef Id="Components"/>

This works fine.

However, I'd also like to add a shortcut to Bar.exe to my start menu. I ideally want to do this in my main wix file, with the Bar.exe component still residing in the auto-generated wxs file. How would I approach this problem without modifying the auto-generated code?