Hey netsuite friends- does anyone know of a way to report on Bins and the inventory status of on hand quantity as of say 3/31. Usually we run BIN related reports day of as to have the snapshot, but wondering if there is any way to run historical bin data yet in NetSuite?

there is no way of doing this. I believe the best way to do it is to build a customization that stores the values and have this customization run nightly