I have joined new and ther are many complexed crystal reports (which are be set to format Microsoft excel (Data only)

The person who created ..in the Database Expert window, Createed New Connection then have selected the database type he wanted to use
and rather than picking a table he picked Add Command and then insert your sql statement.
Now I want to add few more fields and delete some.
How do I do that...since its very complexed and big report they dont want to change anything but few insertion and deletion of fields.

Please Help me.