In Flash Builder is there a way to duplicate/branch a project?

Best practice for that is using a SCM (SVN, GiT, ...). You can easily revert a project/file to a previous state If you don't use one, Eclipse keeps a local history for each of your files. (Team->Show Local story) And if you really want 2 projects, I don't think there is a command for that.

Copy paste the directory and changes the name of the project (.project file).

Best practice for that is using a SCM (SVN, GiT, ...). You can easily revert a project/file to a previous state. If you don't use one, Eclipse keeps a local history for each of your files.(Team->Show Local story) And if you really want 2 projects, I don't think there is a command for that.

Copy paste the directory and changes the name of the project (.project file).

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