I made a schematic in KiCad with hierarchical layout. I'd like to check if the busses are connected the way I want. In this context I often read something about the netlist.
So my question is, how do I generate a netlist and what does it tell me about the connections?
Electronic – KiCad create and understand netlist
kicad
Related Solutions
The solution that you have on your pictures will work fine. I have checked the Battery element in the library editor and it has both pins as a passive pins, so ERC wont complain.
If you want to use +9 V and GND elements from Power library, then you also need to add a power flag. In the reference they say:
It is common to have an error or a warning on power pins, even though all seems normal. This happens because, in most designs, the power is provided by connectors, that are not power sources (like regulator output, which is declared as Power out). The ERC thus won’t detect any Power out pin to control this wire and will declare them not driven by a power source. To avoid this warning you have to place a “PWR_FLAG” on such a power port.
So, using the power flags, you can make following configuration:
Regarding the hierarchical sheets, take a look at this video to learn more (browse the channel, there are lots of very useful videos for KiCad).
You can do this without a schematic. Open PcbNew and click on 
at the right hand side. This will allow you to add any footprint, such as a 1x1 pin header. Make sure your grid is 100 mil. As a proof of concept, I used the 1x5 pin headers 
.
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Best Answer
To generate a netlist, open Eeschema and click on the netlist button
in the toolbar.
This will open the netlist dialog:
You want to generate the default pcbnew format (Kicad's internal netlist format).
Then open the resulting file in a text editor. You will find a section that starts with
(netsIn this file, notice first that each
(Netis listed with a(code)and a(name). After this, each pin for each component is listed that is connected to the named net. To check whether your bus connections are correct, you should find the two pins you want to connect and verify that they are in the same net.You can also do this using pcbnew after you have imported the netlist and done some initial layout. But the text-file method described above should work for you before you get to that step.