To import "White Lists" you need to create a user defined variable list. To do this you need to edit the user policy and navigate to the definitions section. For example;
MyPolicy - > System settings\Definitions\User Definitions\User Definition 1
You can define these User definitions specifying a name (i.e. MyAddresses) and import values into the value section.
To import, open the value field so you can see the 'add' radio button. Hover the mouse over the 'values' (even if currently empty) and right mouse click in the value field and it will give you an import option.
These user defined values can then be used in the main policy for example;
Setting the "Include Addresses" with a value %MyAddress% will parse the user defined values.