I tried creating a recipe in Brewtarget and BeerSmith for an extract brew that I did. The problem is, I don't see the Northern Brewer Gold Malt Syrup in either database and I don't know what number to punch in for it.
I don't know how to do this in your software, since I use ProMash, but I cloned the Briess gold extract profile and renamed it for NB.Worked for me.
HTH,
Alan