I am saying suppose if 700 berths are there and if it is desired that all these 700 berths should be filled by the source station or source region then ir will have to implement a new system where bookings on all these 700 berths will only be available for the desired locations say jyg/mbi/ski in this case . It's an hypothetical system which is necessary to fill a particular train as desired and discussed by rfs on iri..
Agar mai madhubani se booking karunga and aap sonpur se book karoge toh...
more... since madhubani and sonpur shares same quota to aapke dwara ki gyi booked berth jyg-see me current me aayegi hi . So current availabilities toh aani hi hai. Yhan pe ek train ko completely fill karne ki baat ki ja rhi uske liye bs ek hi raasta mujhe dikhta hai and that is explained above ,that hypothetical suggestion to be given to ir in order to fill one train from one location or region.