Another Tolbar Docker?

I have the Toolbar Docker attached to the top of the main window and 2 Dockers (left and right) below the Arranger. So far, so good. I would like to get another toolbar docker attached on the left-hand side. Is that possible. if so, how?

Not exactly possible, there is only a single toolbar docker. You can open the desired toolbar and intermediately position it in the toolbar docker, in order to have a tab you can grab. Grab it and drag it to the left-hand side to dock it there. That is not another toolbar docker though, it's the ordinary "left of main view" docker where you could dock all kinds of windows. Doing that will resize the docker horizontally, so it's not really a good idea to have toolbars share a docker with other stuff.

Got it, thank you. I had open the new toolbar "Floating" then tried dragging it to the left-hand edge but that did not attach it. Nor was there a suitable right-click menu choice. Putting it on the Toolbar docker, then dragging it from there the the left-hand edge did it, but why go round the houses? Also, that messed up my Toolbar Docker for a while - the toolbar tabs reappeared.