Partitioning inside Qubes

Hello,
Is there any way to see/alter the partitions while inside Qubes ?

Easy to do from the outside, like HBCD, MediCat, ect … but what about from the inside ?
i.e: I plugged a new HDD for backups, disk never used, therefore not partitoinned, I can see it in the USB-Sys, but can’t access it, and reflex is to get to it with Kpart or gParted or such, but these are only “seeing” the inside of a qube, not everything
i.e: I want to shrink the appVM pool to add an appTemplate pool

Is that even possible ? (like installing gPart in Dom0)
Thks !