“I would like to add a gap between bars for a Coda in my score and parts in Sibelius, but the gap is only showing up in the parts. How can I make the split system show up in the parts as well?”
In Sibelius 6, you must manually split the multirest in the same bar as the Split System in order for a Coda (e.g. System split) gap to show up in all the parts.
In Sibelius 7, the Split Multirest is automatically added when you select Split System, so normally, these will show up automatically in the parts this way.
However, note that in either Sibelius 6 or Sibelius 7, you also need to have “Keep gaps before codas (that have split multirests)” checked in the Layout Tab of the Multiple Part Appearance dialog for this to work properly.
In Sibelius 7, go to the Parts tab, Part Appearance and select the Layout tab. Check “Keep gaps before codas (that have split multirests)”
In Sibelius 6, select the Multi Part Appearance button in the Parts Window, and select the Layout tab. Check “Keep gaps before codas (that have split multirests)”