Adjusting dollar duration (schweser book 3 ss8 page 26)

This one is confusing! Can the increase in dollar duration adding the other bonds (instead of bond 1 as in the example). or it should be applied to the one with the longer duration? Thanks

could be to all the bonds or the largest one or anyone of the others too. CFAI explains for all the bonds in equal proportion and for the largest bond(controlling position).

Thanks for your adviceā€¦appreciate it