Templates and Dynamic Column Headers

I am working on building a presentation that can be used by my colleagues to present data to various clients. The data sets that we use are extracted from JDA as Excel files. I have it saved as a template file so it prompts for the data file location. The issue is that we use only the first ten or so columns, and after that there are user defined fields. Is there any way to flag those columns that we use and ignore the remaining fields?

Currently it errors out while importing data if there are different columns than the ones that the template was built with. Should I just add a step to the process and only have them copy and paste the first columns into the data source file instead?