Migrate / transfer user collections to new laptop

Hello,

I just bought a new laptop and tried to migrate all user collections from the old laptop to the new one.

I therefore exported the only existing catalogue that stored all my images to an external SSD hard drive and imported it on the new laptop. That worked fine.

However, now the user collections I created are missing. How can I export / transfer the user collections (I created about 20 so far ...) to the new laptop without duplicating the image files on the HDD?

Thanks for your help,

Daniel