sharepoint 2013 page content using snippets

Hi guys, 

i currently on doing web site on sharepoint 2013. i am at stage of creating pagelayout to allow user to edit the content. to do that, i used snippet to create dynamic page content.however, now i have 4 page fields in one pagelayout but it only have one page content option in snippets. i try to use one snippet on 4 page fields, when i author the content in one of the field it update the others too. i wondering if there is a way?

Help!!!