how figure out it?
I cant say for certain from just an image, but it looks like your bookshelf is a single component with several rectangular faces in it. Push pull of one face won’t affect the others. You could do one face and then while the tool is still active, double-click each of the others to push pull them the same distance. They aren’t instances of a component. If I’m wrong, please share the skp file so people can see what you’ve actually got.
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My steps in short form:
1.I’m create rotating rectangle with certain measurements.
2. Make Component. And result of those actions is visible in Components and Outliner windows.
3. Then I try to create (copie) another components from the converted component …but nothing is changing exept dotted frame (like have Groups or Components). And those copies live separate life.
- I’m just learning this program.
- It worcked before this problem.
- I don’t understand why my any new componet can be only single.
sing in/out and same things - done
Share the .skp file so we can see exactly what you’ve done to it. I’m sure there’s a simple solution.
You have a component with a bunch of loose geometry in it. You appear to want five separate components. This simple pilot error.
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To help achieve your goals, some time spent at the SketchUp Campus and at the SketchUp - YouTube channel will be very worthwhile. Both sites are from the SketchUp team. On the YouTube channel, pay attention to the Square One Series. It covers the basics for each tool.
In addition to that problem, you’ve got a bad nesting situation at the other end of the room. The tall case is loose geometry with a group for the low case. The tall case should be a group or component on its own.
It’s a problem with the way you made the group for the tall case.
Do what @RLGL instructed and go through the educational materials.
Actually i have got one really visible difference - different selection mechanism by double/three clicking creates different situation for the future copies of the component. Anyway i will watch tutorials. Thank you 
You are creating the problem by triple clicking on the first component and then copying the geometry within it.