The docs say I can do this in the Gantt window, but I've found no specific instructions on how to do that, and haven't been able to intuit this process.
Another solution would be to restore my Predecessors column. Inconveniently, copying and pasting columns between separate sheets "is not supported at this time."
I imaging the solution is already "out there" somewhere and the fault is in my researching skills.
Thank you for your help.