Let's consider a scenario where it is required to create a A/B test (Test 2) whose test page will be two pages farther into the funnel from another A/B test - Test 1 (Test 1 is on the main landing page.) and Test 2's test page cannot be accessed directly i.e. Any traffic that visits Test 2's test page can only get to that page if they have first visited Test 1's test page.
We want traffic of both A/B test remain mutually exclusive from one another for cleaner data. Hence in order to achieve this , It is required :
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To either reduce the amount of traffic Test 1 is consuming.If Test 1 consumes all the traffic from its test page there won't be any traffic that hits Test 2's test page that hasn't already been subjected to Test1. So, Test 1's traffic must be reduced in order to let some 'untainted traffic' flow through to Test 2's test page or apply an Audience ( say Visitors From Search Engine, Organic Traffic etc) to Test 1 so that only some % of Visitors visiting the main landing page
are exposed to Test1 or if you are Exposing "ALL Visitors" to the Test1 on landing page ,You can specify the percentage of qualifying visitors to include in the activity. For example, you might choose to include 50% of all visitors.