How to and or create new user groups, add users to those groups and restrict users to specified IP addresses.
Who within your Organisation is going to be using Workbooks? Make a list of who they are and give some thought to which areas of Workbooks you want them to be able to use.
When creating a new User you can specify:
Users can be assigned records by using the "Assigned To" field within the different record form layouts; please note however that if this user does not have a valid license allocated to them, it will not be possible to assign records to them.