Redmine

I'm searching for some way to migrate a Redmine project into another instance of Redmine already containing other projects.
I imagine that one way can be copying directly from the DB, but I'm little worried about it.
Anyone can suggest me what is the best way for doing it and how?

Thanks in advance!
Marco

PS.This is my configuration:

Redmine 7.1

GLoc v1.1 running in development mode. Strings can be modified at runtime.
About your application's environment
Ruby version              1.8.6 (i486-linux)
RubyGems version          1.1.1
Rails version             2.0.2
Active Record version     2.0.2
Action Pack version       2.0.2
Active Resource version   2.0.2
Action Mailer version     2.0.2
Active Support version    2.0.2
Edge Rails revision       rel_2-0-2
Application root          /home/marco/Applicazioni/redmine-0.7.1
Environment               development
Database adapter          mysql
Database schema version   92