So before leaving, he had already relocated everyone in Changpan Valley.
As for how to do it, it was actually quite simple.
Back at Si Hou, Xiang Beifei's grandfather, to protect those skeletons, placed their dwelling within the formation of Hou, creating a separate space.
This inspired Xiang Beifei, who had been carving that breath soil block for some time, in order to cultivate a space within the block formed by the breath soil.
He was imitating this ability of the [R-level Reclamation System].
Before attending university, while helping Lu Hong capture criminals, he witnessed a criminal with the ability to reclaim space, who nearly escaped by creating a space on chewing gum.
That criminal wasn't very powerful; his use of the [Reclamation System] wasn't particularly impressive, as he could only open up a small space.