How can I just select a portion of a drawing and move it across the canvas?

[m-lamer]

Hello, I need help but I cannot seem to be able to find the right words to search for an answer so I am asking here: How can I select only a section of a drawing and move it / drag it, without leaving half of the selection behind and being able to continue to draw afterward. English is not my first language but I just want to be able to move something I selected without problems.
When I am in the composition stage it would make things so much easier and It must be possible in ArtRage if a basic app like Ibis can ...
I use Artrage 6 the full version I suppose ? on window 10 I use a waccom intuos 2015.