Can virtual bones be used in control rig?

My virtual bones don’t seem to bend when I use basik ik. Should it be like that or am I not understanding something?
Screenshot 2023-09-03 214357

I tested a Daz3D character and I’m able to use BasicIK, even though I notice that the arm moves with an offset compared to the control for the hand ( which was created on the hand joint and then unparented ).
Have you tried creating the VB just for the forearm and the hand and using the upperarm existing joint as ItemA, then using the forearm and hand VB for ItemB and Effector Item?

I have figured out what was wrong (had to add one more bone that went from shoulder to upper arm), but I still need some help. I cannot correctly copy the rotation of an arm to virtual bone.

Try the Rotation Constraint node, you should be able to copy the rotation.

I wish there was at least something on google. At this point I better create a separate thread for this.

Yep, I got similar results using a Daz3D character with Control Rig…if it helps, here is what the IK arm setup using AnimBP and VB for a Daz3D character.

Thank you, I will stick with your solution for now. I really hope copying rotation is possible in control rig, somehow