Making ADRs at the same time for different people?

[Lincolnshire]

We are planning our first family trip in December (yay!) with 5 adults, 1 toddler & 1 baby, split into 3 hotel rooms at WL. We aren't always planning to eat together. Can I make ADRs under two different guests' names, for different restaurants at the same time from my account on My Disney Experience (i.e. 1 group at BOG, 1 group at California Grill at 6:00 on a Friday)? Or do I have to create an account with username/password for members of my group who aren't staying in my room? I have already linked everyone's room reservations, so I can see everyone under my account.

Sorry if this is a dumb question but I can't seem to get a straight answer when I call Disney Dining and learning all the ins and outs of the system is tough! I'm hoping to get it sorted before our 180 day mark.