Technically you COULD use a directory... although I think that would screw with some of Qole's "easy" scripts.. since it's trying to mount an image or device .. not just chroot to an already active directory.

The programs to make partitions I already listed... cfdisk and sfdisk. Both I think are available in the App Manager.

However if you've already cloned then you can't just up and "make" a new partition without losing your current one. You need to either RESIZE your current partition, and then make a new one on the remaining space, or use your EXTERNAL SD card to store Easy Debian.

I'm not sure you'll have enough space to use your 2GB Internal SD card for BOTH a cloned OS, and Easy Debian. While Technically possible... neither OS will have any room left for many apps.

You have an N800.. nevermind.. you're internal SD card could be any size.

It's best to do something like I've done,
Flash -> Diablo
Internal -> Diablo
External -> Mer

Just instead of a bootable Mer.. you just use the External for your Easy Debian. Use cfdisk or sfdisk to repartition your external card, put a 100MB or so FAT partition at the front, then however many GB you want for Easy Debian (up to the max of the card). You'll have to create the filesystems (assuming mmcblk0 is device):
Then setting up your /home/user/.chroot respectively.

If you want to resize your SD cards partitions to add one for easy debian... Have fun.

(maybe try totally starting over?? Use the install-tools by penguinbait to Clone to SD instead of the easy one.. that way you create a file that lists your partitions, make 4.. 1 FAT, 1 swap, 1 ext2 for Maemo, 1 ext3 for Debian.. then install tools will do all this for you.. but you lose data.)