Unfortunately there is no formal interface for importing this type of data. I have heard of people working out the database schema where this data is stored and directly inserting/updated data into the database, but have never done that myself, and couldn't recommend it as an easy approach.
Also be aware that the implementation of targeting doesn't really scale to work well with targets that have more devices explicitly listed in them than you can effectively work with in the UI. i.e. The interface allows for say a few 10s or maybe (at a stretch) a few hundreds of devices on a target. But if you try to have thousands of devices on a target then you're likely getting into uncharted territory where things may not work well.
Scenarios that may be helped by being able to import target details and have targets that explicitly list a large number of devices (or IP address) would be a good thing to describe in the new Ideas area of Flexera Community. That will allow other people would be interested in this capability to vote on the idea to gauge the level of interest.
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