CSE citation for Word 2010

No need for an add-in, it's available from the ribbon :):
Using Microsoft Word 2010’s References Feature (for Students) :: Productive Geek
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Creating References

Microsoft Reference function is accessible from the reference tab.

Word 2010 comes with a list of default referencing style. Choose the referencing style that you want to use.

Click on the ‘Insert Citation’ button to open the add citation window.

Word 2010 allow us to add different source type such as ‘Journal Article’ for our essay.

Click on the insert citation button to view a list of your citation and click any of them to create an inline citation in your essay.

You can create a bibliography page by clicking on the ‘Bibliography’ button.

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Perhaps this is what you are looking for: (download included in the link)
BibWord : Microsoft Word Citation and Bibliography styles
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For End-Users (updated May 10, 2009)

Styles
A collection of styles created using the BibWord template. Styles include:

• Associação Brasileira de Normas Técnicas (ABNT)
• Association for Computing Machinery (ACM)
• American Chemical Society (ACS)
• American Medical Association (AMA)
• American Sociological Association (ASA)
• Council of Science Editors (CSE)
• Harvard AGPS - Anglia - Exeter - Leeds
• Humana Press
• IEEE
• Lecture Notes in Computer Science (LNCS)
• Modern Humanities Research Association (MHRA)
• Nature
• Vancouver
• ...

BibWord Extender
A tool for creating numeric in-text citations based on the ordering of the bibliographic entries. With some styles, it can also be used to generate year suffices.