[NTG-context] How to display the pages of a particular section in another PDF?

I can use this code to display page 5 from a PDF:\externalfigure[filename.pdf][page=5]I am making a teacher's guide for a workbook (workbook.pdf). I need to be able to display on the page all pages of a particular section. The teacher's guide uses the same section titles as the workbook, e.g.: 17-A: Title 17-B: Title In other words, there is 1:1 pairing of section titles in the teacher's guide and the workbook. Is there any way to tell ConTeXt to display all of the pages for a particular section? \externalfigure[filename.pdf][section=17A] --Joel