Open Sage 50 > go to HELP Tab > Help Topics > index.  You will find the answer you are looking for there.

I have searched that portion of my Sage and am unable to locate the specific instructions related to uploading an inventory list.  I will keep looking, but if you know the specific sections those instructions are listed in, please reply back here.  Thanks for your response.

I would export the same item type (like stock) with the headings. Use that as your guide to set up the other stock type items. Make a backup of your data before import the new items