Right-click an existing column and select Insert > Insert
Columns to the Left or Insert Columns to the Right.
Select the new column by clicking above the first row of the column, like
this:
Select a Column Type in the Properties panel.
Select a Column Value if you selected Document Property, Material
Property, or Custom Property for the column type. The values in the column
will be automatically filled-in.If you select Material Property for
the column type and Mass or Volume for the column value, then the column
data will only be filled-in when a material has been assigned to the
object.
