G2G means transfering part of the inoculated grain into an other partly filled non-inoculated (and sterilised) jar. Thus "grain to grain". If done inside a sab the contamination risk is minimal. This method is ideal for sclerotia producing strains as they hard to fruit and it is thus quite difficult to obtain new spores. It is also great if you want to increase your grow size before your first harvest and don't want to use liquid culture or agar, or simply can't be bothered to collect spores create new syringes etc.

In your case you can just spread the existing jar between 10 new jars and get a much higher yield than just one jar (obviously). If the existing jar is contaminated they will all be contaminated however.

Just make sure you wait until growth is visible to increase chances of success.

Edit: I didn't notice you are using PF, in that case g2g won't work because of the dry layer of vermiculite needed. Sorry! But I hope that at least clarifies things. Assuming you own a pressure cooker I'd suggest looking into grains for your next grow.