Jasne, możesz użyć analityki, czegoś takiego:
SELECT DISTINCT YEAR, MONTH, WEEK, CPG, DEPT, CUST_ID, R_ID,
SUM(P1) OVER (PARTITION BY YEAR,MONTH,WEEK, CPG, DEPT, CUST_ID, R_ID) P1,
SUM(IC) OVER (PARTITION BY YEAR,MONTH,WEEK, CPG, DEPT, CUST_ID, R_ID) IC,
SUM(B1) OVER (PARTITION BY YEAR,MONTH,WEEK, CPG, DEPT, CUST_ID, R_ID) B1,
P2, B2, TOT, TOTAL_TXN, TOTAL_AMT
FROM (your_query)
