I'm using standard wizard UI and also there is Orchestration ItemGroup in project file.
<IncludeOrchestrations>True</IncludeOrchestrations>
<IncludeOrchestrations>True</IncludeOrchestrations>
<!-- Orchestration artefacts to be included. -->
<ItemGroup>
<Orchestrations Include="$(ProjectName).Orchestrations.dll">
<LocationPath>..\$(ProjectName).Orchestrations\bin\$(Configuration)</LocationPath>
</Orchestrations>
</ItemGroup>