The PADS Integrated Project clearances do not have specific "Drill To..." clearances, it uses the Pad/Via to [Trace | Via | Pad | Pad | Trace] clearances. Please see the Netlist Project to Integrated Project Migration Guide for additional information on rule differences:
Why all these differences compared to the NETLIST mode ????
I do not understand....
The Constraint Manager within PADS Layout is based on the capabilities of Xpedition, which does not use the exact same rule set as PADS Netlist traditionally uses. There are plans to update the PADS Integrated Project Constraint Manager to align the rule set to those of the PADS Netlist Projects.