In KiCad V5.1.x bus entries are just local labels, and the blue bus lines are mostly cosmetic. Busses just are not very sophisticated in KiCad V5.1.x. (In KiCad-nightly V5.99 the meaning of busses has been extended).
So there is currently no way to:
With a bit of inenuity and the use of auto increment during repeat and block copy, rotate and mirroring this can be done quite quickly though with:
Draw a horizontal wire in an empty area, about 12 grid points long.
Press & hold [Ins] key to make a bunch of these wires.
Place a label “FX1_1” on the topmost wire.
Press & hold [Ins] key again to insert more labels (with auto increment). It’s preferable to make too many, then not enough.
Drag a box around the labels and wires, just as much as you need. Then [Ctrl + C], [Ctrl + V] to copy & Paste.
You can also add the slanted bus entries in this way.
Place the copied block (which is now attached to the cursor) to it’s final destination.
Repeat steps 5 & 6 for other IC’s that have these signals.
I sometimes use the area outside the “drawing paper” as a scratch pad to make such blocks, make some notes, and (temporarily) park schematic parts.