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Building Menu, under infrastructure, the last option is "Scrap". This will destroy pipelines and cables. It looks like a bolt and screw.

As for dome I don't know try delete key/scrap option in building info on all buildings and then on the dome. Or try the build scrap option.

I finally got up to sol 11 and decided to deep scan my starting territory.....and found out I built EVERYTHING on top of 2 1k underground metal mines.....so I had to restart.