How can I easily manage 'features' - is there a module

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How can I manage 'features' easily - is there a module, as i cannot find one.

 

I have something like 500 products all with different features. How can easily go thru them all and modify them, in say some sort of list format.

 

I also have a situation where i have a category with 35 products, but only 34 features show up, so i have to go thru every single product to see where i have missed a feature. B**ls aching job.