In general, for VS projects, nesting is done by an element <DependentUpon/>. You can fix this by editing the project file directly. Change:
<Compile Include="blah.child" />
To:
<Compile Include="blah.child">
<DependentUpon>blah.parent</DependentUpon>
</Compile>
This works for any file attachments such as .sass -> .css -> .min.css
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