Option to Sync changes when Duplicating a Doc

I built a doc that is great resource for section A but it also makes sense to put in section B so I duplicated it but now they are actually individual docs so if I change something on one of them it won't update the other one. I wish they would both be able to be updated when I change one of them so that I don't have to update things in both docs manually if there's an update to the info I've shared.