Add Selective import feature#139

Edited: I find out that this feature is already implemented. Thanks!

Hello,
It is so good (infact it is nessasery) thet we can select wich items to import during import process. So as time goes on, if we want to add something new to previous projects, we can easily add them without need to spen alot of time to add them manually or to overwite and prpbably loose something from current state.
Kind Regards