You may need to create seperate slides for each item and then create a click action on each item in the 1st slide so that when you click a certain area on the main slide it will automatically move to the seperate slide for that item. Then add a action button to take you back to your mixed slide.
http://office.microsoft.com/en-us/as...293061033.aspx
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http://www.internet4classrooms.com/pp_buttons_show.htm
and
http://www.bcschools.net/staff/PowerPointHelp.htm
may prove useful to you
