It occurred to me that it would be possible to create a single PDF with several typesets in it (e.g. the Default Score Layout followed by individual parts). So now in the Print View the button that controls print out now offers "Append" as well as Continuous/Manual typesetting.
With Append on subsequent typesets will appear below the ones already made. The only limitation I have noticed so far is that you can't use the Command: Set Total Number of Pages Forces the score to be typeset onto the number of pages you choose. Location: Object Menu ▶ Score ▶ Typesetter ▶ Print Layout Internal Name: SetPageCount command for part of the output - it applies to the whole of the typeset. This will be built overnight and needs testing! Richard