I've defined some values using a formula tool on the "Days Pending(Prop)" column and output them into an "Aging Bucket" column. I've hardcoded five values, with others set to NA.

Later, I use a cross-tab tool to convert these values into columns and then apply a summary tool.

The issue is that the "Days Pending(Prop)" column doesn't always contain the five hardcoded values. I need the summary tool to be dynamic, adapting to the available data.
Is it possible to achieve this? Could you demonstrate a proof of concept?