The site has 200 user registered with Joomla User and K2. Now we plan to extend to a second user group. Both user groups have different fields. I read, that there is no import csv possibility in joom profile. I understand, that joom profile has its own database structure. How is it possible, to transfer the old user into this database and to edit both user groups with the same template ?
The good way will be to write a script for you which will import the user in JoomProfile otherwise you need to do it manually (which is not a god solution). So if you are developer then you can write your own script to do that or you can hire us or anyone else for that.