I am working in Pro 3.6 and I added the Utility Network Package Tools (untools) from the Package Manager in Pro. So I believe this question applies to 3.5+.
I was of the understanding there would be a tool to help me add rules to my asset package. I had an iteration of Utility Network that needed a few rules added to make everything work. That was all successful. So, now i am trying to add to the "rules" table in the Asset Package (B_Rules). I added them manually, but I believe that made me skip important GUID application.
I'm struggling to understand how to add these rules to the Asset Package so that my next iteration of a Utility Network will automatically start with the rules I know I need.