Skipping fields during content conversion

is it possible to skip fields during content conversion in file sender adapter?

The case is, the CSV file contains 300+ field and i only need 10. Therefore i have created a datatype with those 10 field.

I was hoping to skip the fields i do not need during content conversion.

If this is not possible i see no other than to create a datatype with 300+ fields by hand. Which will take all day!

Hopefully there is a solution, since i could not find what i needed on the SAP Help or SDN.

Thanks in advance for all your time!