I am writing a book, in the form on an InDesign Book. It has 18 chapters, each in its own document. Often I want to add a cross-reference link to a paragraph in another document in the book, but the only choices I'm given are to other documents ALREADY open in InDesign. Please let me do that. I do not need to see the other document in order to know that I want to link to it. It clutters up my workspace.