SQL & PL/SQL

Thanks to help from Frank Kulash yesterday (https://community.oracle.com/thread/3810284)

I can now use UNPIVOT to start out with this:

with tbl_data AS  
 (select 'N' argument1, 'Y' argument2, NULL argument3, 'Y' argument4 from dual)  
select * from tbl_data;  


ARGUMENT1 ARGUMENT2 ARGUMENT3 ARGUMENT4  
--------- --------- --------- ---------  
N         Y                   Y   

And end up converting a single row output to 4 rows and 2 columns via:

with tbl_data AS
 (select 'N' argument1, 'Y' argument2, NULL argument3, 'Y' argument4 from dual)
    SELECT  *
    FROM    tbl_data
    UNPIVOT INCLUDE NULLS
            (    col_heading
            FOR  col_name  IN ( argument1
                              , argument2
                              , argument3
                              , argument4
                              )
            );

    COL_NAME  COL_HEADING
    --------- -----------
    ARGUMENT1 N
    ARGUMENT2 Y
    ARGUMENT3
    ARGUMENT4 Y

I wondered if there is any way Frank's solution can be changed to include 2 columns (e.g. COL_SEQ and COL_PROMPT) with hard coded values in them, e.g. "1" for the SEQ and "TEST" for the PROMPT, as I would like to do a UNION of Frank's solution with another query which returns 4 columns.

i.e. return:

COL_NAME  COL_HEADING COL_SEQ     COL_PROMPT
--------- ----------- ----------- -----------
ARGUMENT1 N           1           TEST
ARGUMENT2 Y           1           TEST
ARGUMENT3             1           TEST
ARGUMENT4 Y           1           TEST

Thanks