Best Practive - One mapping reading multiple source files

I want to develop a solution for one single mapping reading multiple similar source files that are stored on different directories on my OWB server. I want to be able to determine on runtime of my mapping from what location to load the source file from.
Example:
Mapping: Load_test_data
source file 1: c:\input\loc1\test.dat
source file 1: c:\input\loc2\test.dat
When I run the mapping I would like to use an input parameter specifying the location loc1 or loc2. I would also like to use this input parameter in my mapping to populate one column in my target table with the value of this input parameter. This design would make it possible to dynamically load source files from different directories and also being able to see after loading where the data came from.
Questions:
- Is there a way to create such a design
- If not, what alternative would be appropriate.
Thanks in advance for the feedback

Thanks for the feedback. Unfortunately I do not use workflow together with my OWB.
I now indeed specified the file name and file location in the configuration of my mapping. However I am not able to change then upon executing the mapping. Data file name and file location are empty and greyed out when I execute my mapping. It always takes the values I specified in the configuration of my mapping
What I would like to do is specify the location upon runtime when I execute my mapping, but I don't know if this is possible. In addition I'd also want to use the data file location as an input parameter for one of the columns I populated in my target table.
Then in the end I would be able to use one mapping and read multiple sources files from different locations and also be able to check in the end where the data was loaded from.
Hope you can give me some more feedback on how to set this up in OWB.
Many Thanks!
data file name parameter to ma

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