Redirect subite level & root

Hi, I am trying to create a rule in redirects.config that redirect from: subsite in domain A (with port number) to subsite to domain B, example:

• http://domainA:port/sites/site1 ->http://domainB/sites/site1
• http://domainA:port/sites/site2 ->http://domainB/sites/site2

It should alsoinclude a ruleto redirectrootlevelthat excludesthe rest

• http://domainA:port/ -> http://domainB (excludes  /sites/siteX)

I am notable to createthese rules,rulesoverrideother rules

Thanks in advance

Best regards
Oscar