Moving from Mac to PC

Since the original question referred to the setup of catalogs, I assumed the user was referring to Lightroom Classic.

Which Lightroom are you using? If you are using the cloud version, which is the forum you posted this question in, then there isn't much to the process of changing computers. Just sign in to Creative Cloud on your new computer. If you are using Lightroom Classic, the process is more involved. Jim linked to a good article that explains how.

In terms of how to move to a new computer, have a read of this: https://www.lightroomqueen.com/how-move-lightroom-to-new-computer/

If you plan on using the same images on both computers then you will want to copy the images in their folders exactly as they are organized now to the new computer. You will also want to copy the catalog to the new computer. Take note, however, that you will not be able to share images between the two computers. But you can create collections and share them in the cloud. But that is for another discussion.

If you are going to be using the same images on the new computer, i.e. using the same catalog, you might have to go through the process of finding missing folders. That really isn't a big deal and doesn't take a lot of time. It's just something that has to be done once.

You will only need a single subscription, but it will only be possible to use one of the computers at a time. Brief answers, I realize. But hopefully it will get you started.