I would divide the plants you want multiples of. Get the soil really really really wet and try to pull them apart by the root ball, if that is a no-go, you can just cut them apart. They will be in shock and not very happy, but in a few weeks no one would know the difference.

I have done it a few times in a pinch and my plants look fine after a bit of a rest period.

Keriann~

Depends a lot on what the plant is. Some plants survive having their roots upset; some are less forgiving.

One question - if you divide them, do you have a place to plant all the plants? If you have *dozens* of pots, you could end up with hundreds of plants. Might be more realistic (depending on the size of your garden and your willingness to do the work) to thin them to the most likely survivors and plant those.