Importing .vcf contacts by groups

[mdpreda]

Hello,

I have 13 .vcf contact files that I want to import in my Roundcube e-mail account on different folders.
The problem is that when I try to import them, all the contacts are going to "Personal" folder.

What should I do to import each .vcf file in a separate folder?
I'm using Roundcube Webmail 0.9.3 with no nstalled plugins because I'm using it on a shared cPanel hosting account.

Thank you in advance.