There is a large body of writing and historical practice on how to make decisions in this manner (communal organization and management of production). The anarchists Mikhail Bakunin, Peter Kropotkin, and Errico Malatesta wrote about this in the 1800's. Of course the Soviet Union was remarkably successful at growing from a very poor nation to a global superpower in 50 years. I absolutely oppose authoritarianism and that was their downfall, but they were an amazing economic success. Anarchists would say absolute centralization of planning was the failure, as perverse incentives developed until it fell apart. But decentralized planning seems extremely interesting. A more recent author who has written extensively on libertarian socialist decentralized planning and organization is Murray Bookchin. I think you would enjoy this 1994 piece on what Bookchin called "Communalism" [1]

But to provide you a basic answer to advance the conversation more immediately: People must be educated to follow any society. We've never expected the checker at Home Depot to understand logistics of her store. But this is due to the division of labor, not a limitation of the human mind. When people imagine a totally different society this tends to include schools which raise people for that society. And so every person would be taught more about how all the bits fit together and how to make decisions collectively. As I said, many different schemes have been proposed and tried for what system would work best. But someone like Murray Bookchin would suggest that different regional cooperatives can make their own decisions about how best to organize. I would be remiss not to mention the Mondragon Corporation in the Basque Region of Spain. They're a federation of cooperatives with a total revenue of 13B Euro ($16B) in 2013. They do big industrial stuff, finance, retail, and education. [2]

However I realize I am talking about how really big decisions get made. Maybe you're asking about individual firms. It's past my bed time but for that look at how cooperatives are managed. This history of a grocery coop in San Francisco is very interesting. [3] Here's a list of other Bay Area cooperatives. [4]

[1] https://social-ecology.org/wp/1994/09/what-is-communalism/

[2] https://en.wikipedia.org/wiki/Mondragon_Corporation

[3] https://web.archive.org/web/20170606172106/https://www.rainb...

[4] https://nobawc.org/