We need to be able to add costs into our inventory. So we buy a used machine, add our man hours refurbishing it, and buy parts that are added to it. Maybe it's bought for $6,000 but we add $20,000 of parts and labor to it, all of which have to be associated with that machine and become part of COGS when it's sold. With Sage - our old accounting system- it was possible. Unfortunately we have no way to do this in Zoho Books.