When dormant can divide the plants & transplant into new areas... In summer can take cuttings.. apply 0.1% IBA (rooting hormone) stick in well drained soil & mist.....

Pachysandra is a slow but sure rooter. I root my cuttings in sharp sand without hormone. Sometimes it takes several weeks to a month to get cuttings to root, but they stay nice and green and never seem to fail.

Mostly I propagate by division. I generally will dig up an area of about a square yard with a spading fork (AKA perennial fork) and this will give enough plants and bare stolons to replant this area and about 5-6 square yards more to the level that they will fill in visually in 1 years growth.

I'd love to have a "patch" of Pachysandra!. I have my first one at work in a greenhouse, it's about 7 inches tall. Very slow growing, and only one stalk. I can't wait until it gets larger.
In my opinion, I believe that geoforce is correct in saying that division would be best.