if you are familiar with procom, you can set up a script to input FCAS tables.
you will need
a FCAS to deny only 555 for each NPA
a FCAS to alow only 555 for each NPA
Next you will to modifiy your RLI's, one entre will have fcas for the deny and a duplicate entre that will alow only 555 and at that poit you will use a DMI to delete all digits and inst the 1800 #. This is very time consuming since a FCAS table will only alow 15 NPA's. I went in groups of 10, ie 1989 = FCAS 98 (for the alow), 198 ( for the Deny) and RLI 98; 1202 = Fcas 20, 120 and RLI 20. This alows my other techs add NPAs without thinking. This has saved our hospital money. Scripts do make this easier.