Hello Sylvona,
Thanks for stopping by planDisney with your question! You ain't never had a friend like
Disney Genie+, especially when visiting Magic Kingdom. There are so many rides with Lightning Lanes, you'll be able to book several Genie+ reservations throughout your day.
You are correct. Disney Genie+ and Individual Lightning Lanes are purchased separately, and have different rules that apply to each. You can only book one Genie+ attraction at a time, beginning at 7 AM on your day in the park. You can purchase up to two Individual Lightning Lane attraction reservations per day, beginning at 7 AM if you are staying at a Disney Resort Hotel, or at park opening. So yes, it is possible to have a Genie+ return time booked for an attraction like Big Thunder Mountain Railroad and purchase Individual Lightning Lane return times for both
Space Mountain and Seven Dwarfs Mine Train.
If you happen to be park hopping, you can also purchase Individual Lightning Lanes for other parks, as long as you only purchase two total per day. Just remember to make sure you select return times after 2 PM, or whenever park hopping is allowed, and give yourself plenty of time to get to your second park.
Hope this helps. Have a magical vacation!
Diane