Create as many books as you need to represent the resources that you want to track and enjoy the flexibility to easily re-structure as your activities change.
On the web console press the red New Book button.
On the Create new book dialog choose a template book that corresponds to your necessities. All templates, except the Empty Book, come with sample accounts for that particular purpose. (Of course you can change all those account and groups as you wish)
Click one of the templates to create a new book.
The newly created book is immediately ready for use. Proceed to rename the book by clicking on the name, manage the settings and the accounts to fit your situation.