Parameter Concatenation

I am looking to create 3 parameters that will be combined to create a 4th parameter.

Here is the idea

Parameter one they would enter their state like (OR, CA, FL)

Parameter two they would enter their Private Code (6879,0987)

Parameter three they would enter their file name (6879.xlsm, 0987.xlsm)

Parameter four would change this into a path like \\network\outside\locational\"Parameter One"&OT\"Parameter two"\Parameter three

So you would end up with something like this \\network\outside\locational\CAOT\6879\6879.xlsm

This would then be used as the parameter file to update the queries location for that report.

I hope that makes sense.

thanks