If you have a settlement with all of your supplies you can assign people to make a supply line to a different settlement and so on. The wire should be running from a shack and leads to a boat with a switch inside of it. Hope this helps, let me know if your having problems with it.
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Thanks for the advice! Just to clarify this other settlement is behind the Minutemen castle?
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An easy way to move stuff from 1 settlement to another is grab everything from the workbench then drop on the ground. Make a companion pick it all up because that way there is no limit to what they can hold.