How I could make a bus connection in a prototype shield?
I would mount the components to the board first then create busses with wire. Depending on the components you might be able to use the same row the component leads are in or you may need to lay the bus in the adjacent row and bridge the gap with component leads.

A quick search turned up an image that sort of gives an idea of what I'm talking about. If you look closely you can see the wire bridging the gap between each solder pad.

https://www.bing.com/images/search?q=soldering+protoboard+bus+wiring&amp;view=detailv2&amp;&amp;&amp;id=EF1514CA6486FC44E0132E7DE1CFBFDBFD015809&amp;selectedIndex=15&amp;ccid=vQ%2beHllm&amp;simid=608022938507020230&amp;thid=JN.TBpqHtXSA7o3dTvD8dPVaQ&amp;ajaxhist=0