Tim S. Do you mean link a card from one Gamma into another Gamma? If so, then yes!
Select the three dots on the upper lefthand part of the card you want to move, and click Copy To. This will give you the ability to copy the card to the Gamma of your choosing.
This feature works even if you want to take a card from a presentation and move it onto a site. You can also copy cards in bulk by selecting them from the film strip on the lefthand side and right clicking.
I included a short gif showing how to do this.