Running debian from internal BBB flash

Hi all,

I have managed to get my BBB running Debian unstable from a plugin
8G micro SD card. After installing everything I currently need, this
external micro SD card is currently only 16% full.

My understanding is that the internal Flash of the BBB is 2G which
suggests that I should be able to transfer my current install from
the external micro SD card to the internal Flash.

Is this correct? If so, how can I do this?