I am trying to build a model that looks like the above screen shot. Tier 1 - Tier 5 are list items and everything in the top row are list items. I am having trouble getting any ending balance to work (for reference, I'm able to begin the tier 2 starting balance and so on and so forth to pull the ending balance from the prior tier) but I can't put a simple subtraction formula in ending balance without getting a circular reference. I've tried adding a mapping column called previous tier that is formatted by the tier list and doing a lookup but that is giving me the same issue.