How can I spawn an actor rotated around a point?

I am trying to spawn in walls to build a structure relative to a point. I have a root actor rotated 180 degrees and I want to spawn the walls relative to that rotation for example, 100, 50, 0 would be -100, -50, 0. I want to be able to get the rotation of the root actor and have it figure out where to spawn the walls relative to that rotation.

You can set spawned actor rotation (and other transform values). Here is screen:

To do this, hover mouse over Transform, click right mouse button and click SPLIT. Do it again with Rotation, split again - you will have something like above. Do same steps with your source actor Rotation (split).

Now you can add values to X,Y,Z. You can add this like on sample or use vars or other dynamic parameters.