Freeze GameObject position with a virtualbutton

Hello,

I am fairly new to Vuforia and I am trying to create a board game where you place physical objects  with imagetargets  in physical space that have a 1 to 1 translation to a gameobject in Unity. I want to create a virtual button that when pressed, the tracked GameObject freezes (Position and rotation).

Does anyone have any tips on how to achieve this?

Thank you!

Argyrios