PA700: Adding an ending to an existing arrangement

[WhatPound]

Hi

I have a number of MIDI songs which I have created using the Sequencer Mode, with a style and tempo chosen in the Style Play mode.
Within a song I didn't want to keep playing the same chords over and over, so I used copy, to create several copies of the same verse, as you do.
Now, having created the songs a while ago, I would like to add an ending to some of them.
I've tried, using the Step Backing procedure, adding the End1, End2, End3 as an element after the last measure, but I only get a couple of notes, and not the kind of elaborate endings that you get when using the End buttons while you're playing.
I'm probably doing something wrong in the Step Backing procedure.
Is there an easy way of adding full endings to existing songs?
I would rather not go through the whole process of creating the songs again, setting the style, tempo, chords, etc, just to create an ending.
Thanks