You want to export the computer attributes from the entire network, make modifications en mass and then import the lists after the modifications are made.
The current version of LanGuard LanGuard does not have such functionality. Refer to the How do I Configure, Assign, and Use Attributes in the LanGuard Computer Tree? article for more information regarding the operations with attributes in the LanGuard console.
To suggest such a feature for future versions, you can submit a feature request directly to the product management group.
Meanwhile, you may consider the workaround. Attributes are written directly to the database - default name LNSSScanresults12 - and saved to the table dba.ComputerSetting. It may be possible to run an SQL query to modify or update these, but this would be outside our support scope.