Is it possible to create a selection file from an excel

Hi,

I am loading data from a standard BW cube, and I have a requirement to restrict the load to BPC on several cost centers. I am using the DM package with UI to do the selections. But its huge list where I can't use ranges either. I am looking at the following possibilities.

1. if its possible to convert the list of cost centers into the selection file format used by BPC OR

2. is it possible to mention the list of cost centers to exclude from selection any where. Transformation or Conversion file.

Thanks for any kind of help.

thanks,

ravi.