I have an attribute assistant rule that generates sequential facilityID's based on the separate generateid table.
This is an example of one:
wOperationalArea|AREAID|RPAREAID|3|RP[id][seq]|True
I am trying to replicate this in ArcGIS Pro with Arcade, are the new attribute rules able to reference this same generateid table?
The new template attribute rules are designed for this very purpose and the Generate ID Attribute Rule tool is what you want. However, the attribute rule that gets created by this tool is standalone arcade and does not use the old GenerateID table. All the configuration is set in the attribute rule itself. You need to use the tool's UI to define how you want the attribute rule to behave. Based on your example, it looks like you are using Generate ID By Intersect from the AA, which is possible in the new tool with the Sequence by Intersect parameter.
Thank you! As there is a lot of pre-existing data, once I implement this new rule, would I need to temporarily use the update trigger to sequence all of the pre-existing data so there are no duplicates?
If you want to populate ids into a new field then sure. But your existing data should be fine if you use the ID Builder parameter to define the Starting Value to the next available value. That should prevent collisions with existing data.