Datatable column suggest with extra combo


What is the best way to show a suggest for a datatable column that includes a combo dropdown to select a different data set for the suggest. I have a datatable column where a user can select a Project. However I want the user to be able to select a Project from another dataset that can be selected with a combo that is in the suggest. I think I saw an example somewhere in a forum topic a few months ago but cant find it.