There are three ways of creating documents: (1) Create Blank; (2) Create Copy; and (3) Create Derive.
Create Blank
This way of creation basically returns an empty document, modifiable at will.
Create Copy
This way of creation duplicates an existing document called the original, except the stored passwords. The new document may then be modified at will.
Create Derive
This way of creation derives the new document from an existing document called the source, except the stored passwords. Modification of the new document will proceed only with some restrictions.