It appears that you can connect to a PLS-CADD database via any ODBC connection. How you get the data out of PLS-CADD and into ESRI i have not yet figured out. There needs to be a way to export the data; locations of structures, the attributes about each structure - height, class, structure type; if you have materials data tied to the structures within PLS-CADD it would also be nice to bring over this data through and possibly tie this to accounting software, work orders, costs etc.