If you have your contacts exported into .vcf files, they can easily be imported into for example iCloud, Google or your email program. However, if you have a couple of hundreds or thousands of contacts, and equally amount of .vcf files it will be very inefficient to import each contact one by one.
A solution is to combine all contacts into one single .vcf file. By importing the combined .vcf file all your contacts are imported at once.
To combine all .vcf files into a single one can easily be done using a Windows command prompt (cmd).
copy *.vcf allcontacts.vcf
Now import the file allcontacts.vcf into iCloud or similar.