Plane with angular offset?

Hi,

A while since the last time I used Creo, so a beginner question Image may be NSFW.
Clik here to view.

I recently re-installed Creo.

Now I am starting to model, I'd like to make a datum plane with angular offset.

I click the plane in the datum group.

Then I select a plane for which I want the new datum plane go through (I select the through from the drop down menu.).

I try to select one more plane using control button. I can not select more planes or objects as references (The datum plane placement window is open.)

How to proceed forward?