Do you mean that what I said went over your head? Or was it the readme file's explanation?
In either case, here's how it would work. If you go to your site and click on a category and then on a product, you'll see something like this in the address bar of your browser...
http: // www. somesite .com /catalog/index.php?main_page=product_info&cPath=6&products_id=8
That indicates that it is product id #8 in category id #6. (You can also get this from the admin/products and categories listings.)
So to make a stylesheet for that particular product, you'd make a blank document in a suitable text editor (not a word processor) and name it p_8.css, or if you wanted one for all products in that category, you'd name it c_6.css. If it was a subcategory, you'd name it maybe c_6_11.css or whatever numbers were required.
Then, in these custom stylesheets, you'd put something like this...
#cartAdd { display: none; }
That would have the effect of hiding the div that contains the Add To Cart button and the field where you enter a quantity. There's no need for anything except those lines used for hiding elements in this stylesheet. Your regular stylesheet will still be used by Zen Cart for everything else.
When you've got your custom stylesheets done, ftp them into your custom folder's css folder and you're done.
Try it; it can't hurt.
Rob