Navigate to Leads and Contacts under the lead management main menu
Select your database
Using the bulk select check boxes besides the records choose the ones you wish to transfer
Now Click the Menu Icon to the top right side of the screen and select Transfer records to another database
A screen will appear asking which Database you would like to transfer the records to.
You will be given the option of MOVE or COPY and may need to map the fields you wish to transfer data into (if they use different lead forms).
Moving the records means that you will simply move them from one database to another
Copying the records means that you will make a copy of them to another database.
When you've finished mapping click Transfer.
Hint: Historical Notes and Appointments is a copy option that will include the activity of the records on transfer, if you do not click this option it will send the record(s) to the target database without any previous history copied.