The Catalog Index feature is exclusive to the Pro releases.So, with Acrobat X you have to be using Acrobat X Pro; not Standard, not Reader.The 'click path' is actually:Tools - Document Processing - Manage Embedded IndexAside from having to use PRO there is another prerequisite for embedding an index.The PDF file of interest must be open in Acrobat Pro.Clicking on 'Manage Embedded Index' results in a dialog being presented.In the dialog click the 'Embed Index' button to embed the index with the open PDF.Note - A PDF can have Fast Web View or an Embedded Index but not both.Be well.
When inserting content from a PDF file into your web page, the format of the text in the PDF can sometimes be different when pasted into the web page editor.