thats done in the menu section, go to main menu and click on a menu with sub menus yours would be something like your products then in the parameters play around with the numbers in the #leading and #intro then go back to your page you should see intro’s starting to appear, if you don’t want the whole page appearing put some of the text in the into part of your products page and thats what you will be able to read.
Check this http://lisbon.directrouter.com/~peacockq/index.php?option=com_content&task=blogsection&id=4&Itemid=26
what you see here is the into text which I placed in the intro section of each item.
To break things up even further you can then go to your item page and tell it not to show the intro text, then your not reading all this text twice.
Hope this helps
mfcPhil