I see there're multiple azure devops pipelines under AspNetCore repo but there seems no doc about it.
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Not sure I understand the issue. We do have docs on using Azure Pipelines with ASP.NET Core: https://docs.microsoft.com/en-us/azure/devops/pipelines/languages/dotnet-core. If you have questions or requests for info about https://github.com/aspnet/AspNetCore/tree/master/.azure/pipelines, please open a PR or issue over there.
No, I'm not talking about "Using Azure Pipelines with ASP.NET Core", but "Using multiple Azure Pipelines within one git repo". The ASP.NET Core repo link here is for an example, because it contains multiple Azure Pipelines.
I see. OK, yeah, I think there's a bit of a hole that I was thinking about too.
Found how to config this. It's a little bit confusing that cannot be accomplished without visual designer.
Steps: Go to Azure DevOps -> Your Project -> Build -> Edit your Build Definition -> Switch to Visual Designer -> Edit YAML file path.


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Yes you can create a pipeline manually and target it to the yaml in a sub-folder, but that's some external configuration which somewhat contradicts the Infrastructure-as-Code principle. Therefore I have created a separate issue https://github.com/MicrosoftDocs/vsts-docs/issues/6367.
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Found how to config this. It's a little bit confusing that cannot be accomplished without visual designer.
Steps: Go to Azure DevOps -> Your Project -> Build -> Edit your Build Definition -> Switch to Visual Designer -> Edit YAML file path.