Export\Import WSUS Updates

Hi

I have a Q about export\import process in WSUS(3.2).

I have a primary WSUS server that I`ve exported all updates from and imported all updates to a disconnected

WSUS server.

now I have some new updates that I need to export and import.

my question is, do I need to export all files again? or do I have any option to do an incremental export or

something like that?

Hope you understand me..

Thank you!