There are two ways to sort your bibliography in categories. See both alternatives below.
1. Create bibliography categories in a Word document
This option only affects one specific document.
Select Categorize References from the EndNote tab to open the Configure Categories dialog.
Create your categories by clicking the Category Headings (+) button to display a blank text field below the Category Headings section.
Enter a unique category name. For example, enter Journals as a category if you want all your cited journal articles to appear under this category (in the example below, two categories are entered: Litteratur and Offentligt tryck).
Continue creating categories. For example, you may create one for Books, Conference Proceedings, Electronic Media, or other types of material.
Using the drag-and-drop method, drag a specific reference to the appropriate category under the Category Headings section.
Continue this process until all references are assigned a particular category.
Check the "Uncategorized References" section to ensure that all references have been assigned to a category.
2. Create bibliography categories in an output style
This option affects all documents where this output style is used.
Go to Edit → Output Styles and open the style you wish to edit
Select Categories under the Bibliography
Type the headlines you wish to use and click on Insert Reference Type to add the types of material to be included.