If you see #REF! or #NAME? errors, you may have accidentally deleted a hidden calculation cell. It is often easiest to start with a fresh copy of the GSheet v2.1 template and transfer your data.
It fully supports complex character builds, including dual-classing and dual-casting combinations. gsheet v2.1
Many cells have built-in "Notes" (indicated by a small black triangle in the corner). Right-click and "Insert note" or hover over them to see detailed descriptions of your spells and abilities. If you see #REF