SQL & PL/SQL :: Combination Of Values

I have a requirement in this format.

These are the scripts for the 2 input tables

CREATE TABLE TMP_split
AS
SELECT 1000 AS grp_id, 'abc' AS ATTRIB, 60 AS PCT FROM DUAL
UNION ALL
SELECT 1000 AS grp_id, 'pqr' AS ATTRIB, 40 AS PCT FROM DUAL;

[Code].....

The output needs to be in this format

key | val | grp_id | pct
------------------------------------------
6~7~8 |DIM_11~DIM21~DIM31 | 1000 | 60
6~7~8 |DIM_11~DIM21~DIM31 | 1000 | 40
6~7~8 |DIM_11~DIM22~DIM31 | 1000 | 60
6~7~8 |DIM_11~DIM22~DIM31 | 1000 | 40
6~7~8 |DIM_11~DIM23~DIM31 | 1000 | 60
6~7~8 |DIM_11~DIM23~DIM31 | 1000 | 40

Is there a good way to dynamically obtain this output either by PL/SQL or by query?

This is a case where combination needs to be used. However, I am not able to arrive at the right algorithm for this