I added an “Appendix A” to my MS Word document. First, I want to add page numbers in the appendix starting with A-1 using Word’s ability to number consecutive pages accordingly
(ie: A-1, A-2, A-3…) AND I want the A-1 page number to appear in the Table of Contents I auto-generated using the features of MS Word.
How do I do this?
You can do the page numbering by using section breaks: insert a section break (Layout > Breaks) before the appendix, make sure the footer is set to NOT “link to previous,” edit the page numbering so it starts at “1,” then type “A-” before the page number on the first page (it will continue on subsequent pages).
When you generate your TOC, though, you’ll need to type “A-” before each appendix page number. I’ve been a professional writer/editor for a few decades, and even the most senior desktop publishers I know manually add the “A-” to the TOC. If anyone knows how to do that part another way, I’d love to learn it! 
Misnomer: While I appreciate the thought, this brute force method does not fool Word into pulling the correct page number into the auto-generated Table of Contents. Supposedly, what I want can be done, but I have yet to figure out how. It has something to do with utilizing the “Chapter” headings option within the pop-up box that allows one to set the page number (ie, start at page 20, for example).
I’m not sure that copying/pasting “A-” a few times qualifies as “brute force,” but the info I provided does auto-generate the correct page numbers. It just doesn’t pull in any page number info that was manually typed.
The method you mentioned requires you to first create a new style specifically for the appendix header – doable, but not terribly straighforward (even for some advanced Word users), which is why I didn’t offer this method as an option in my first post. I honestly never even think to do it. 
Anyway, once you have the style settings the way you want them, apply that style to the header of your appendix. Then, select the page number and format it (Header & Footer Tools> Page Number > Format Page Numbers): select “include chapter number,” and the style you created for the appendix.
The instructions I provided are easier and faster, unless there’s a reason that you really need the “A-” info to be included in the auto-generated TOC – e.g., if you’re creating a document that someone else will be updating, and they’ll need to be able to update the TOC without copy/paste instructions from you. As I mentioned, the steps I provided are the preferred method for both me and the other professional editors/desktop publishers I work with, but we tend to create documents that no one else will update without our participation. Either way, you’ll need to use section breaks in order to get the page numbering to work correctly.
Best of luck!
You are correct.
You can set up page numbering to include the “A-” preceding the page number from that dialogue box.
You should create a heading style that you’ll use as the chapter heading. I always use Heading 9 – it’s unlikely that outline numbering (if my document has outline numbering) will be nine levels deep. So the numbering can be A, B, C, D, etc. – those will be your chapter numbers.
Those numbers don’t actually have to appear in the body of the document, if you don’t want. You can format the number as hidden text, and you can format the Heading 9 style itself the same way, so you can put text like “DO NOT DELETE” in the body of the document, for the benefit of future users. I format the style to have red hidden text. It will be visible if you have show/hide turned on, but it won’t print. And it will be invisible if show/hide is off.
As Misnomer points out, you’ll need a section break at the start of the appendix to your document, and every subsequent part of your document with a new series of numbers. So if there’s an Appendix B, start it with a section break. Then apply your Heading 9 style (with text like “DO NOT DELETE”) to the first paragraph of the section.
Check the box that says “include chapter number.” For “Chapter starts with style:,” select Heading 9. Use a hyphen as the separator.
The actual number that appears after “A-” is also controlled from that dialogue box. Choose “start at,” and select your value. Sounds like each Appendix should start with 1.
Now “A-” is part of the number, and will be included in the table of contents.
Misnomer says that the instructions he/she provides are easier and faster, and that’s true, to a point. But if you’ve got fifteen or twenty appendices, then you’ll want a method that doesn’t require manually editing your TOC each time you revise the document. Also, if others are going to work on this document, you really do want updating the TOC to be a simple pushbutton task, which it will be once you’ve set it up the way I’ve described. Yes, there’s a bit of effort setting it up this way if you’ve never done it before, but once it’s done, it’s done. Press F9 to update your TOC, and that’s it. No editing required.