Don't worry about putting in endings or repeats. Enter the chords as one big song. You can put in repeats, etc later. The repeats, endings, codas, etc are there as a convenience to make the display and/or printouts easier.

You can use copy/paste to quicken your entry of the song. Once you get the hang of things, there are shortcuts that will automatically copy your chords when making repeats, etc but save that for a rainy day.

Remember, once your entire song is laid out, you can set repeats if needed.

BTW, I think your terminology is different than BIAB which a song has an Intro, Chorus(es), optional tag and Ending.

R