How can I add document-internal links in Pages 5?

I have a number of very large dicttionary documents (300+ pages) all of which have internal links. The internal links allow you to jump from one letter to another, so that, for example, if you're looking at words that begin with S, you can go to the A-Z letterboard at the beginning and end of the S section and immediately jump to any other section. I've also got links in the middle of the document leading to parts in the front matter (so, for example, a mention of the word "relative clause" will be linked to a section in the grammar discussing relative clauses). The nice thing is that these links would remain active when exported to .pdf, so when I shared them with others, the internal links continued to function. Each document has hundreds of these internal links. All of them appear to have been broken by the new version of Pages.

Is there a way to create document internal links like the ones I used to use for Pages '09, or has this functionality been forever removed from Pages? If the latter, who do I scream at?