Daniel T Li Spreadsheets [480p · HD]

The "solid feature" you are likely referring to is the structural analysis and design logic

Daniel T. Li Spreadsheets Report

To put together a post about Daniel T. Li ’s spreadsheets, it’s best to focus on their reputation for precision in structural engineering. Daniel Tian Li, Ph.D., S.E., is well-known for creating specialized structural design software and highly detailed Excel spreadsheets that simplify complex calculations for industry professionals. Post Content: Structural Engineering Toolkits daniel t li spreadsheets

The software is licensed through Engineering International Inc. rather than sold as individual files. The "solid feature" you are likely referring to

Chartered Structural Engineer in the United Kingdom (MIStructE). Licensed General Engineering Contractor. Step 1: =UNIQUE(Data[Category]) → generates a list