I am trying to see if there is a way to have a lisp routine will find all instances of a particular block and replace the attribute value by looking up the existing attribute value in an excel file and replace it with the new value in the excel file in the next column over. I currently have the routine built that will create a selection set of all instances of this block, run a repeat function to check and replace each attribute value but it's based on a conditions function which means I would have to type about 200 conditions. Can anyone help?