The Azure DevOps Migration Tools allow you to bulk edit and migrate data between Team Projects on both Microsoft Team Foundation Server (TFS) and Azure DevOps Services. Take a look at the documentation to find out how. This project is published as code on GitHub as well as a Azure DevOps Migration Tools on Chocolatey.
WARNING: This tool is not designed for a novice. This tool was developed to support the senarios below, and the edge cases that have been encountered by the 30+ contributers from around the Azure DevOps community. You should be comfortable with the TFS/Azure DevOps object model, as well as debugging code in Visual Studio. Both paid and community support is available through our recommneded consultants as well as our contributors and many DevOps consultants around the world.
Ask Questions on StackOverflow: https://stackoverflow.com/questions/tagged/azure-devops-migration-tools
What can you do with this tool?
What versions of Azure DevOps & TFS do you support?
NOTE: If you are able to migrate your entire Collection to Azure DevOps Services you should use Azure DevOps Migration Service from Microsoft. If you have a requirement to change Process Template then you will need to do that before you move to Azure DevOps Services.
The Technical Details