Within MS if you want to use an excel file to drive your ITEM TYPE pick lists, it currently only support one excel file.

If you want to have multiple options you have to use the excel tabs, but this is forced to one or the other not both

This is controlled by defining ITEMTYPE_PICKLIST_EXCELPATH & ITEMTYPE_LOOKUP

I would like to have an option to pick many excel files, each one having its own purpose for the pick lists.

Ian