Sort through the dried beans, picking out and discarding any rotten beans or debris.
Rinse the beans. Soak them overnight in lots of extra water. (They will double in size.)
Cook them on the stove, slow cooker or in the Instant Pot. If cooking Lima beans in the Instant Pot, add 1 teaspoon of oil to prevent foaming issues. If cooking in the Instant Pot, and the beans are well soaked, add water to just cover the beans. Use the bean / chili cycle and cook for the amount of time specified in the charts below in the notes section.
When finished cooking, allow for natural pressure release (if using the Instant Pot).
Using a slotted spoon, put the beans in the Vitamix or other blender. Add enough cooking liquid to blend the beans. You will need to use the tamper. Blend the beans until smooth, adding cooking water, or water as needed.
Spoon the beans into storage containers and freeze what you won't use right away.
I live at 7000 feet so it takes me much longer to cook my beans than it will you. I cook soaked Lima beans for 35 minutes and soaked Alubia Blanca and Great Northern beans for 51 minutes.
These charts may help you find cooking times for your beans: