I tried to get an old VMware OSX machine working yesterday.Best I can tell, this has no connection to the Mac version. There's no copy function and the only paste function is the placement of components, and that can only be done by clicking, not a keyboard command.
http://cds.linear.com/docs/en/software-and-simulation/LTspiceShortcutsForMacOSX.pdf
I was stunned to learn that this worked perfectly. (Except that you cannot select a circuit as noted in #3. You have to hit F6 first and then select the circuit. LTspice is all verb-noun instead of the usual noun-verb model of most other apps.)The Suggestion I read, and would like to try is...
1) open circuit 1 in window, covering half of the workspace.
2) open circuit 2 in separate window, covering the other half of the workspace.
3) Select Circuit 1, then press F6.
4) Drag Duplicate Circuit into Window 2.
Basically it's a drag and drop approach to copy / paste.
SUCCESS!!!!! (insert dance smiley here)I was stunned to learn that this worked perfectly. (Except that you cannot select a circuit as noted in #3. You have to hit F6 first and then select the circuit. LTspice is all verb-noun instead of the usual noun-verb model of most other apps.)