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My initial thought was to string out the whole song. But, two things happen. One, it takes longer to generate being the are more measures although the same patterns. Two, the screen gets too confusing for me.

It should not take any longer to generate. Putting repeats, etc make it easier to look at but the song should still be the same length thus have the same generation time. Play around with the Fake checkbox on the main screen. That may help.
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if you can elaborate on how a tag works in this context. I did not think of tying the AB together and just doing a repeat from there. I suppose I can set the repeat to 2. That would cover the bulk of the composition. Being I never strayed beyond the scope of the repeat sign at the end of the composition, this is the foreign part for me. So what you are saying is that I can continue in the grey measures by imputting the C & B parts. How do I get rid of the "ending" measure that always sits at the end of the repeat to insert the additional measures?

Go into Song Settings (Ctrl N). You define tags and endings there.

I suggested a linear format for your song because it took me quite a while to figure out the endings, repeats, D.C. ... stuff. It can be frustrating. Once you get the song right, putting in the repeats and stuff can be learned as you go. I use the repeats etc in my lead sheets only. The songs that I use in performance are 'Unfolded' into that linear form I described. And if you use RealBand in the future, it unfolds BIAB songs.