working on history changesets

Question

Hi,

I'd like to know if it is possible to aggregate some changesets into one. Let's say, i have a repository looking like that:

default tip stable 1.2
added new project file
added new project sources
added new project data
...

I'd like it to be:

default tip stable 1.2
added new project
...

Basically i'd like changeset "added new project" to contains all 3 changesets "add new project file", "added new project sources" and "added new project data"

Thanks by advance for your answers ;)

Hubert