Add new type in list of type

Hi!

I want to add a personal type in the list of type in parameter.
Like this:
-Type of project
-type of ticket
...
-type of {My Personal type}

I've already add the new type in the table 'type' in BDD and I'm able to use it in activities.
The problem is that if I want to add new parameter in my personal type, I have to do this directly in DataBase and it would be better if I could do this in projeqtor.

Thank's

Thanks a lot but it is for my final year internship, so I would like to do it by myself.
I'll search on the forums to see if I find what I am looking for.
Thanks.