Copying a SharePoint Designer workflow

I am working on a SharePoint site that has multiple custom lists. Each list will have a SharePoint Designer workflow attached to it. The workflows are very similar to eachother. Each workflow is several branches long so it takes quite a bit of clicking to set one up.

I figured after I was done with the first workflow I would copy it, paste it, rename it, and point it to the second list, then change workflow conditions and actions accordingly. However, when I opened the workflow copy I discovered that the custom list assignment had become greyed-out and I am unable to point it to a different list.

This has got me wondering why Designer locks down the list name and if there is a way to work around this manually.