Splitting , copying & pasting multiple tracks at once

This being my first post, I find it remarkable, after watching at least a dozen YT videos, apparently no one has addressed the following:
Using Audacity 2.3.0 with OS High Sierra, how , after having highlighted all of the tracks (Select all/ Command+A), do you split, copy and paste a multiple-track clip without losing the highlighted multiple tracks ??
The minute i try to copy all of the tracks, the select all view disappears and reverts to one highlighted track.

I’m assuming it can’t be done in Audacity or am I blind to an easy task?
Such an easy operation in other DAWS seems to be the impossible in Audacity!!
Thanks!

Please break that down into step by step instructions that we can reproduce. It is not clear what you are doing or what you are trying to accomplish.