what is hotkey for open all selected groups and its sub objects

If the project or hierarchy windows have focus, you should be able to use your keyboard's up/down arrow keys to navigate, and right/left to expand or collapse the current selection.

Not quite what you're asking for, I think, but maybe a step closer.

What about in editor view when selecting individual objects from different groups?

I found a way that is not bad at all and is that you can select the objects in other groups while the parent keeps slected, then I go to hyerarchy and deselect these parents and subojects keep selected. But a kleaner way to select directly objects withing the group by clickin in the Scene window?