Yes you can. To publish one rule at a time in Production, all you have to do is move the status slider from Approved to Published, while the study is still in Testing mode.

If you want to publish multiple rules at a time, all you have to do is make sure they have a status of Approved. When you move the study from the Testing to the Approved container, all rules with a status of Approved will be published in Production.

This task can be performed if you you're assigned the Rule Publisher role by the user administrator.