I don’t usually discuss technical writing on my blog, mainly because technical writing is my profession, and I try to spend as little time and energy on my profession outside of work hours. But in this case, I’m working on a side project, and I found a solution to a problem I thought I should share.
Summary
In InDesign, when creating an index, to cross-reference singular and plural words in a single topic, add both the singular and plural words as separate topics, then rename one of the topics to match the other, and the topics will be combined.