Overview: Instead of writing a figuration (arpeggio or similar) many
times, once for each chord of interest, you can write it once and
write block chords, and then expand the figuration for each chord.

{{doc:expand_figuration:block-chord-segment.jpg}}

First, you need a segment that contains (a) a chord, and (b) one
measure of figuration (arpeggio-type stuff, but it can contain passing
tones etc).  

{{doc:expand_figuration:figuration-segment-0.jpg}}

That segment has to be specially marked:

 * In the segment editor, select the chord and Phrase > Figuration >
   Make Parameter Chord

{{doc:expand_figuration:figuration-segment-1.jpg}}

 * Select the entire figuration and do Phrase > Figuration > Mark
   Selection As Figuration

{{doc:expand_figuration:figuration-segment-2.jpg}}
{{doc:expand_figuration:figuration-segment-3.jpg}}

Now in the main window, select that segment and every block chord
segment that you want to expand, and Segment > Expand block chord
segments by figuration.  

{{doc:expand_figuration:figuration-main-0.jpg}}

{{doc:expand_figuration:figuration-main-1.jpg}}

A new segment (or segments) will appear.  It will contain figuration
on the block chords.  You'll probably want to move it and relabel it.

{{doc:expand_figuration:figuration-main-2.jpg}}

{{doc:expand_figuration:figured-segment.jpg}}