Community Builder Plugin - update,modify

hallo there. it is a very simple project but requries knowledge of Joomla and its components Community Builder and K2. I need an update of the the plugin to be compatible with the new version of Community Builder. Also in this version, i choose categories of K2 by typing them in a field seperated by comma. This should be replaced with a list in which there will be the option to select a parent category and with this way the children categories will be chosen. Finally i have added some extra code in the php file in order to get some data from another module. This must be continued. thank you