Hi Yu Feng,
You don't create subrepositories in SourceTree but add existing repositories. To add them, just context-click in the sidebar, or go to the "Repository" menu and hit "Add Subrepository" and then select the repository you want as a subrepository whether it's local or remote. Then you specify the local relative path, this is just where it will be within your project.
Hope that helps
Supported Platforms macOS Sourcetree has a lot to offer and, like many developer tools, finding and using it all can be a challenge, especially for a new user. Everyone might not love ...
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