All your keywords from one single category can be seen in one single chart. In order to this this first select all the keywords from your category as shown in the screenshot below:
Later click on 'manage selected keywords' and in the drop down you would see an option as 'show charts', clicking on which a single chart will be displayed with your selected keywords within that category.
We hope you find this helpful! If you need any further assistance, please contact us and we'll be more than glad to help you out.
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