
The table behind the grid is PORTAL_SECDYVW and as you can see from the image below, the PORTAL_AUTHNAME field has %EDITTABLE defined as a prompt table. The PORTAL_AUTHNAME is the "Name" column you see on the grid.

Now, we would want to assign table PSCLASSDEFN_SRC as prompt if the drop down value is Permission list and PSROLEDEFN_SRCH if the value is Role.
/*Record PeopleCode: PORTAL_SECDYVW.PORTAL_AUTHNAME.FieldChange*/ Evaluate PORTAL_SECDYVW.PORTAL_PERMTYPE2 When "P" DERIVED.EDITTABLE = "PSCLASSDEFN_SRC"; PORTAL_SECDYVW.DESCR = PSCLASSDEFN.CLASSDEFNDESC.Value; Break; When "R" DERIVED.EDITTABLE = "PSROLEDEFN_SRCH"; PORTAL_SECDYVW.DESCR = PSROLEDEFN.DESCR.Value; Break; When-Other End-Evaluate;