It appears that when I add a variant to a product the Fulfillment option goes away. This Fulfillment option was on the product as "Shopify" before I added the variant, but then the option disappeared. It is not in the variant's "edit" options either. I can't add it back in with the bulk editor either.
I've seen screenshots on another post that the "Fulfillment" option is in the bulk editor options, but not there for me. Anyone have thoughts?
Ok, I'll answer my own question here because I figured it out. It was a bit of an odd (sorta buggy) non-display issue. The individual products had "Shopify" as the FULFILLMENT SERVICE option, but variants had no option.
All I had to do was go into Settings > Shipping and add a custom fulfillment option and then the "Shopify" option and new one I added both started to show in the variant's Inventory section as "Inventory managed by" (under the variant's "edit" option).