How to add new entries to the local database?

[mjmeans]

So when doing a server restore (or forensic server analysis) it can happen that you need requires KBs containing specific file versions that are no longer published by MS in the update catalog; though they are still available if you can find the direct link to windowsupdate.com. When doing local work using Get-KbUpdate -Source DATABASE, I see that kb's are also not listed. How do I add this information to the local db? And where is the local db stored and can it be copied from one machine to another?