Then you can use what I do, All-In-One Settlement Solution: https://www.nexusmods.com/fallout4/mods/6304
It makes a craftable 'generator' (which only costs 1 steel, I think) that can be placed in a settlement to give 40 food, 40 water, 40 bed, 100 power, 100 defense, and increases settlement 'happiness'. Now, beds don't just pop into existence (though that would be cool), it just tells the game that the settlement has those resources so you almost never get alerts from the settlement about their 'needs'. You can craft as many as you want in a each settlement, assuming you have the resources to do so. The settlements still exist, you can still build them up manually if you want, but it lets you get around having to do so.