I just did this not too long ago. Here’s what you do.
On your card piece you are going to have the following 2 items:
Return to Deck
Menu text (leave blank)
Keyboard Command (something like ALT CTRL R)
Then pick what deck you are sending the card to
Trigger Action
Menu Command (Whatever text you want on the right click menu, like “Send to Draw Pile”)
Keyboard Command (something like CTRL R)
Watch for these Keystrokes (CTRL R)
Perform these Keystrokes (ALT CTRL R and DOWN)