title: Keep campaigns tracking with multiple GA accounts
body: <p>I have 2 google analytics accounts for 2 subdomains (www-exemple.com and s.exemple.com)
  Users have to go through www-exemple to get to s.exemple</p>
  
  <p>My question is : <br>
  How can i keep track of the campaigns in my 2 GA accounts. 
  If a user came to 'www-exemple' with a 'BLABLABLA' campaign, how can i know if he continued his navigation to 's.exemple' and get the same 'BLABLABLA' campaign on my second GA account</p>
  
  <p>The purpose is to know if a campaign managed to make a user go to 'www-exemple' and then to 's.exemple'</p>
  
  <p>Thx !</p>