Depending on the nature of the sources of data you are working with, you may choose to either import your documents into your project, or create them within NVivo.
There are number of features which you can employ for different purposes while working with your documents:
Annotate document content to record your reflections on particular selections
Create 'See Also' links from one document's content to another - to indicate its relevance
Create nodes and code as thoughts occur whilst reading through the document's content (This is particularly helpful when using field notes; as you type, you are thinking about the important categories you should create)
Create nodes to gather the answers to each of your interview questions and review to determine whether the questions need rewording (This can be especially useful at the early stages of data gathering)
In the Volunteering Sample Project
The documents in the Interviews folder were auto coded by heading level to create the tree node Topics - Interviews and its children, Q.1. Current use of time, Q.2. Time use ten years on, Q.3. Volunteer work means? etc and gather the answers to these interview questions from all participants.
Create a memo for each source to store a hunch or a fleeting observation, or the recalled context that was not in the interview transcript. The source and its memo can be linked together using a memo link.
In the Volunteering Sample Project
The memo Mary's Interview - Context contains additional detail which may be relevant in the analysis of this source. This memo is linked to Mary's interview transcript document.