declare IsTable  INTEGER:=0;
begin
select count(*) into IsTable from DBA_TABLES where table_name='NEDW_M_B_ADSL_D';
if IsTable=0 then
   create table NEDW_M_B_ADSL_D as
   select * from NEDW_M_B_ADSL_D@lnzd where rownum<=10;
else
   insert into NEDW_M_B_ADSL_D select * from NEDW_M_B_ADSL_D@lnzd where rownum<=10;
end if;
end;

execute immediate ' create table NEDW_M_B_ADSL_D as 
  select * from NEDW_M_B_ADSL_D@lnzd where rownum<=10'