Magento 1.7.1 Multiple Product Import One Row
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When importing a product through admin in Magento Community 1.7.1... It requires any product that you want to show in multiple categories needs to be on a new row. But I have 1,000 products I want to show in different categories. I have the excel formula ready but I need Magento to import multiple categories by one row dividing them by a comma. Example:
It will only import like this

_category	                                       
Fish/Aquarium Filters                              	
Fish/Aquarium Filters/Sumps                             


I need it to import like this:

_category	                                       
Fish/Aquarium Filters,Fish/Aquarium Filters/Sumps              