: Whenever you're changing the website profile number (the # in UA-XXXXXXXX-#), you need to make sure you're adding a new website profile in GA. Once you do this, you will see a new section

Whenever you're changing the website profile number (the # in UA-XXXXXXXX-#), you need to make sure you're adding a new website profile in GA. Once you do this, you will see a new section for that site in GA.

Multiple website profiles look something like this and a single website with multiple profiles looks something like this.

In a case like this, I'd suggest going with a single website profile, but have multiple profiles within that (like the second screenshot shows). For this, you'd need at least 3 different sub-profiles:

Master roll-up with unfiltered data
A profile for your buyers
A profile for your sellers

Now, the real question is how do you segment this traffic? Is it via different URLs or via just server-side logic? Both ways you can filter out the traffic via a Filter in GA for that profile. You can read more about filters in GA on their support site. You'd most likely need to use an custom advanced filter that either checks for a certain subdomain/subdirectory or checks against custom variables that you would need to pass for member type.

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