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You can use an EndNote library for multiple Word Documents.
However, refrain using multiple libraries on a single Word Document to avoid linking problems.
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When you send your word document to other people, we cannot assume that they have or use EndNote software. Therefore, it is a good practice to convert all the citations to plain text before sending it to other people:
Remove Field Codes > Save the Document
Please note that X7 will no longer work with Word on your Macintosh computer if you upgrade to High Sierra. In this case, you will need to either purchase X8 (https://endnote.com/buy) or you can transition to another citation management program such as Zotero or Mendeley.
There are a couple of ways to insert citations into your text:
Method 1
Find and insert citation(s) to the document (from Word)
(in Word) Position cursor > Find Citation(s) > Search > Highlight reference(s) > Insert
Method 2
Find and insert citation(s) to the document (from EndNote)
(in Word) Position cursor
(in EndNote) Highlight reference(s) > Click Insert Citation button
How to edit or remove in-text citation?
(in MS Word) Highlight citation > Edit & Manage Citations
How to change the style of references?
(in MS Word) Format Bibliography > Pull down the Output Style Menu