This will get you the APN# in front of the number.
(strcat "APN# " :NO_APN@019_parcel_w_prcl_all_tab)
About the hyphenation
So far I can't get the hyphens. There seems to be a limit of 3 in the number of operations you can do in an expression. To put in the hyphens you need 4. This is the expression needed.
Code:
(strcat "APN# " (substr :NO_APN@019_parcel_w_prcl_all_tab 1 3) "-" (substr :NO_APN@019_parcel_w_prcl_all_tab 4 3) "-" (substr :NO_APN@019_parcel_w_prcl_all_tab 7))
This would turn what in the OD "XXXXXXXXXX" to "XXX-XXX-XXXX".