During a recent Parcel Fabric implementation we used the sequential numbering tool on parcels that we built from a CAD file, essentially a subdivision with approximately 20 parcels. We ran the tool on the PID field, then ran the tool on the PIN field, then again on the Lot_Num field. So, basically we're run this tool three different times. I would recommend, if it hasn't already that the sequential numbering tool have the ability to be setup to number multiple fields and run once.
Robert.