Hie would like to use group visa.

Renee, if you want to apply for the group type entry permit, you must join in a travel group organized by an agency. Otherwise, even you are five persons, you need to apply for the individual tourist L type. No matter you finally get the group type or individual type entry permit, I don't think you can stay in China for six months uninterruptedly. The L type allows you to stay for three months at most.