HI HOmerJ,
The only way that I have found to do this is to set the parameters within the main query using the @@ within the select statement. This will set the parameter to a column within the excel report, then within the post processing section,, you can access that column through the (Cells(1,'''').Value) designator. After which if you would not like that to appear within the excel report you can run a deletion of that column at the end of your post processing script, such as the following command:
Cells(1,'''').EntireColumn.Delete
Hope this helps,
Dan