I looked at Wikipedia and it says that Closed Captions are, basically, subtitles. In the UK we use the word subtitle for any text that appears on the screen which conveys, in text, speech and or sound effects. The US and others make the distinction between what they call subtitles (speech) and closed captions (sound effects, music description, etc). That aside, I have replied to your query on Closed captions that I hope will help you import your transcripts. I have used other subtitle programs and they all seem to be unweildly and not have exactly the same format for their files.
Such is life.
Kintara Human beings, who are almost unique in having the ability to learn from the experience of others, are also remarkable for their apparent disinclination to do so.