Converting PR to PO - combines lines using the same part #

Anyone know if there's a way to use the same part # on multiple lines of the PR and when it's converted to a P.O. it won't combine them into one line summing the quantities and price?  For non-inventory parts we use  a part # such as consumables but each line on the PR has a different description to identify what the consumable is.  When the PR is converted into a P.O. , the P.O. lumps all the lines with the same # into one and removes the description identifying the details.