There are 3rd party programs that will add, delete, change, or swap family and shared parameters in bulk. CTC’s BIM Manager Suite comes to mind most readily. As I understand it, doing this in Dynamo is technically possible, but has quite a bit of overhead since you would need to retrieve the directory, open the family, modify the parameters, save & close, then repeat multiple times. I believe the Automating Automation work that Andreas did a while back is where you would want to start looking but it’s been a while since I’ve looked at it, and when I did look at it I was no where near as competent with Dynamo as I am now so a lot of it was way over my head. Not that I’m all that competent now… (i.e. I’ve gone from 1% to 10% in competency).