Define test variants and associate them to the right Use-Cases.
Any part of your logic can be limited to only apply in a specific A/B testing variant. This means that (if you create 1 test variant) 50% of the visitors will get the control (all your logic Use-Cases except the ones which are connected to your test variant) and 50% will get your test variant (all your logic Use-Cases except the ones which are connected strictly to control or to other test variants).
First, click on the Create experiment green button at the top left, add a test variant name and click on Add.
Then select, duplicate or add the Use-Case(s) which should be tested, go to the Settings tab, and connect them to your new test variant.
Then click on Save & Test, test the behavior before publishing in the test view and then publish.
After reviewing your test results, if you want to keep the winner, then go to the Create Experiment dialog again and select a test variant as the winner.