Is it allowed in Islam to complete reading one Quran by multiple people? Is it permissible to divide the Quran into chapters among people in order to complete reading it for the benefit of a deceased person?
Bismihi ta'ala
Yes, it is allowed, and indeed a desirable act, where a circle of people agree on reciting specific parts of the holy Quran, for the reward of the whole khatm to be gifted to someone who has passed.
It is very much encouraged to do this, and hopefully others around you learn to do it as well.
With prayers for your success.