Installation of software distribution without booting from the ISO file system before?

Such feedback sounds nice.

that is not the way the standard openSUSE installer works.

This view can be reasonable.

I imagine that a command can be constructed so that a software installation will be started from a selected ISO file as if it would have been booted from an other storage device.

… whose Calamares installer should be able to copy and install the Live system to local partitions.

I do not want to install Live systems at the moment.

I am trying to configure boot menus for installable systems.