create parameter from concatenation

amitchandak 

Those links don't apply to my specific situation (at least, I don't think).  My situation is more generic.  To be more clear, let's say that I have the following two sources:

1) 'some super long path'\Excel_file1.xlsx

2) 'some super long path'\Excel_file2.xlsx

Even though I won't be changing the sources, it's still a good idea to parameterize them.  At a minimum, I would create two parameters (one for each source).  But, since 'some super long path' is the same path in both sources / parameters, I was hoping to make that some sort of constant (parameter?) that is available to both sources.  I was hoping that the solution would be something like:

parameter A = 'some super long path'

parameter B = parameter A + '\Excel_file1.xlsx'

parameter C = parameter A + '\Excel_file2.xlsx'

But, that doesn't seem to be permissible.  As far as I know, the "list" solution (create parameter for 'some super long path', create list holding the Excel workbook names, create parameter that queries the list) won't work for me, as it requires a current value (a value that must be used by both sources), which defeats the purpose.