How to copy source into target?

Is there a shortcut to copy a whole source segment and make a mirror copy of it on the target section of that segment?

Ctrl + Ins

Thank you!

Do you know how to select the whole target column in memsource Desktop Editor?
I have a translation without "bold", when all of the segments in the source are in bold. I was thinking of selecting the whole target column and click on bold...

Ctrl Shift + "a"