public void ExecuteSubtask(
	string title
)

ProgressService progressService = GetService<ProgressService>();
progressService.ExecuteWithProgress("Opening File",
    delegate
    {
        // Do some work
        // ...
        ProgressService.CurrentProgress.CheckCancel();

        // Mark the start of a new subtask, but inline the code
        ProgressService.CurrentProgress.ExecuteSubtask("Doing this");
        // Do more work
        // ...
        ProgressService.CurrentProgress.CheckCancel();

        ProgressService.CurrentProgress.ExecuteSubtask("Doing that");
        // Do more work
        // ...
        ProgressService.CurrentProgress.CheckCancel();
    }