banks, types, and arrays

I have some code that basically uses 3-4 arrays each about 10,000 units in length. I have about 50 objects of one type, all cubes. I basically cycle through each type object, doing what I need to, then clearing the arrays. I want to store the arrays for each object independently now, but could not figure out how to create arrays in type fields. Is there a way to do this? Is it better/easier to after each one store the array in a bank, then load it at the beginning? Is it faster just to use banks for the whole thing?

Just as a side note, all of the arrays are related, one being a binary heap and the others giving more information about the items in the binary heap.