We are replacing our old naming convention for item IDs to a new one, so all items will receive a new ID. We will place the old ID in a Legacy ID field on the item recod and would like to be able to search for both the new id and the old id for adding transaction lines on sales orders etc. Is this possible?

Search via global search on the custom field yes can be done. or just do a prefix of "inactive-sku"

i have activated "global search" in the custom field for Legacy ID and it works in the global search. However, it does not work in the sublist for adding items to orders. Are you saying that I should use the old item id as prefix for the new item?

I’ve done this, just in a different way. It involves several components 1. Custom record for Old Part number and a list/record field for the new part 2. Custom line item field set as list/record pointing to custom record items 3. workflow that triggers when you enter the legacy number and it fills in the new item If you are simply changing the original item and not creating new ones, this will still work.

nice solution