There should be a way to link to an excel doc, remove unnecessary columns or rows, change the formatting and/or ad paragraph/character styles, so that if the excel doc is updated (with new pricing or different demographics or something) just the information that remains is updated. As of now, if the excel doc is updated, all the work in InDesign (aside from table style) is completely removed and you're forced to either start from scratch, or continue with out of date information.