The following code i have used in process:

DECLARE
v_blob_data       BLOB;
v_blob_len        NUMBER;
v_position        NUMBER;
v_raw_chunk       RAW(10000);
v_char      CHAR(1);
c_chunk_len   number       := 1;
v_line        VARCHAR2 (32767)        := NULL;
v_data_array      wwv_flow_global.vc_arr2;
v_line_count number := 0;
BEGIN
-- Read data from wwv_flow_files
select blob_content into v_blob_data
 from wwv_flow_files
 where CREATED_ON = (select max(CREATED_ON) from wwv_flow_files where lower(CREATED_BY) =lower(:APP_USER));

v_blob_len := dbms_lob.getlength(v_blob_data);
v_position := 1;

-- Read and convert binary to char
WHILE ( v_position <= v_blob_len ) LOOP
 v_raw_chunk := dbms_lob.substr(v_blob_data,c_chunk_len,v_position);
 v_char :=  chr(hex_to_decimal(rawtohex(v_raw_chunk)));
 v_line := v_line || v_char;
 v_position := v_position + c_chunk_len;
-- When a whole line is retrieved
 IF v_char = CHR(10) THEN
 v_line_count := v_line_count + 1;
-- Convert comma to : to use wwv_flow_utilities
   v_line := REPLACE (v_line, ',', ':');
-- Convert each column separated by : into array of data
   v_data_array := wwv_flow_utilities.string_to_table (v_line);
-- Insert data into target table
   IF v_line_count > 1 THEN
   EXECUTE IMMEDIATE 'insert into NON_DYNAMIC_USER_GROUPS_TEMP (ID,WORKSPACES,GROUP_NAME,MEMBERS) values (NON_DYNAMIC_GROUPS_TEMP_SEQ.NEXTVAL,(:1),(:2),(:3))'
   USING
   v_data_array(1), v_data_array(2), v_data_array(3);
   end if;
-- Clear out
   v_line := NULL;
  END IF;
 END LOOP;
END;

Here for 3rd column i have to insert multiple values with comma separator from csv file, for ex in v_data_array(3) i have to entered ABINNAYA,BARATH,CHELLA this has to insert in table as ABINNAYA,BARATH,CHELLA.

Thanks