This will COPY the selected objects into a private list. You can then move to another card, even in another stack, and Paste the group using Pst on this palette only.
1. Select Copy
2. Select objects to Copy
3. Select "nothing" to stop selection process
This procedure is harmless and nothing can be lost.
Pasting is done by locking the screen and moving back and forth between the source card and the target card to copy and paste the objects. Object positions are maintained. There may be a delay.