When creating an Information Link in the TIBCO Spotfire Information Designer, you may not be able to add a column from the data source tables. After selecting the column on the left, the "Add" option will be grayed out as shown below:
This is because before adding a column to create an information link, the columns must first be created as column elements in the TIBCO Spotfire library, and then the column elements are what are added to the information link (not the columns from directly within the data source).