Sub-Domain Move to Backlight

I have a sub-domain site that was built about 10 years ago using various Turning Gate templates via Lightroom prior to Backlight. Is there an easy was to move these from the sub-domain to the main domain and convert them to Backlight? I have searched the documentation, but I don’t seem to find my exact answer.
Thanks
Ray

Something that old won’t be convertible to Backlight. It would need to be CE4 or newer to migrate to Backlight

Thanks, that’s what I figured.
Ray