I applied for all 4 of ours individually (mine, my husband plus 2 kids). I just attached the same documents to all 4 applications - ie husband's job contract, receipts for school fees, school reports plus a statement of ties to Australia for each of us. It doesn't matter which one of you has the job, (I don't work at the moment), you are here as a family and you all need your own RRV
I think you need to click through in order to get to the page where you can attach documents. If immigration feel that something is missing, they will email you or put a message on your immi page