Correct way to Sync Profiles according to Brave

I have been researching the forums and Reddit to find out how to correctly sync.
As with the vast amount of info in both areas i am more confused than when i started started.
Basically my understanding is a profile is a separate instance like a new user.
Settings have to be redone but in relation to sync do i create a brand-new sync chain?
How do i get that new profile on my other PC’s / devices ?
Is it case of create a new sync chain then on other PC’s open up new profile and paste in sync chain to drag everything across?
Or do i use my current sync chain ?
Will it work in my IOS apps?