i wonna to produce a page with listing of all groups, for my template.

However i aren't able to find the way in which the way i can perform this.

Maybe I must give a new file during my template folder?

Thx

Sincerely

Have a look at Template Tags/wp list categories Β« WordPress Codex for that function and code good examples. You will want to create a page template to make use of that function by itself page: Page Templates Β« WordPress Codex.