If the code you ran specified
<< Set Add File Name Column( 1 )<< import data;
The MFI will create a new column in each table created called "File Name". It contains the name of the Excel workbook. The MFI also gives each data table created a name based upon the workbook name followed by the individual Tab name.
Therefore, when the Concatenate is run, with the option
Create Source Column( 1 )
specified, an additional column named "Source Table" is created in the concatenation result table.
and it contains the workbook name followed by the Tab name. From what I interpreted from your question, that should provide you with the information you need. If you want the data from the 2 column displayed in a different form, such as combined into a single column, all that you need to do is to create a new column with a formula that concatenates the information from the 2 columns together.
Jim