Yes, it is possible to migrate projects from one Azure DevOps (ADO) organization to another. There are a few ways to accomplish this, depending on the size and complexity of the project.
One option is to use the Azure DevOps Migration Tools, a set of open-source tools that can help with migrating data between ADO instances or organizations. The tools support a wide range of migration scenarios, including project-level and repository-level migrations, and can migrate data such as work items, source code, and build and release definitions.
Another option is to use the ADO REST APIs to export data from the source organization and import it into the target organization. This method requires more manual effort than using the Azure DevOps Migration Tools, but can be useful if you have specific requirements that are not supported by the migration tools.
Before starting a migration, it's important to plan carefully and test the migration process thoroughly to ensure that everything is migrated correctly and that any potential issues are identified and addressed in advance. You may also want to consider using a third-party migration service provider who can help with the migration process and provide additional support and expertise.