Hello,
I am creating a shift selection survey and would like to have previous selection removed from dropdown for subsiquent choices Please see link below. First time building form but have seen this functionality before. If you could provide a link or step by step it would be great.
http://screencast.com/t/UhqUIPG6aF
What would be more helpful would be a screenshot of your main data source. In general, you'll want to add a filter for the selections available, if the selection isn't already being used.