Migrate data from 4.2.3 to 4.4.1

Hello All

Is there a tool available to move selected data from my old 4.2.3 installation to the new 4.4.1 installation.

I would like to move some but not all.
Tickets — I can get the tickets but not the content and/or history.
Custom Fields
Users and rights.

Both systems are currently functioning

Thanks Bryon