https://docs.microsoft.com/en-us/dotnet/core/tools/dotnet-sln
Often we will use this to create one off solutions and then combine it with Visual Studio Solution Updater (https://github.com/aolszowka/VisualStudioSolutionUpdater) to generate custom load-outs for developers. We don't have access to Visual Studio 2019 yet and therefore do not have Filtered Solutions https://docs.microsoft.com/en-us/visualstudio/ide/filtered-solutions?view=vs-2019 Its unclear if this would work as expected in Traditional Synergy projects in any case.
This should work for both Traditional Synergy in Visual Studio, DBLNET, and DBLNET Core Projects; as it stands today none of them work and error with the following:
S:\TimsSVN\7x\Trunk>dotnet new sln -n SynergyProjects
The template "Solution File" was created successfully.
S:\TimsSVN\7x\Trunk>dotnet sln SynergyProjects.sln add Synergy\CoreLibraries\SynergyStructures\Program\SynergyStructures.synproj
Invalid project `S:\TimsSVN\7x\Trunk\Synergy\CoreLibraries\SynergyStructures\Program\SynergyStructures.synproj`. The imported project "C:\Program Files\dotnet\sdk\2.1.507\Synergex\dbl\Synergex.SynergyDE.Traditional.targets" was not found. Confirm that the path in the <Import> declaration is correct, and that the file exists on disk. S:\TimsSVN\7x\Trunk\Synergy\CoreLibraries\SynergyStructures\Program\SynergyStructures.synproj.
If you try this on a DBLNET Core Project:
C:\Users\aceo\source\repos\TestDBLNETCore\TestDBLNETCore>dotnet sln TestThis.sln add TestDBLNETCore.synproj
Project 'C:\Users\aceo\source\repos\TestDBLNETCore\TestDBLNETCore\TestDBLNETCore.synproj' has an unknown project type and cannot be added to the solution file. Please contact your SDK provider for support.