Get SUM of Amount based by remove the duplicate id

Get SUM of Amount based by remove the duplicate id

From the below table I want to sum collection amount based on the unique Opportunity-ID. If there are two duplicate opp ids I need to consider one row to count the sum.

Note I cannot remove the duplicate rows as these rows merged with another table which I need to build another report.

I am creating this report in Pivot table and I need to segregate the report by website..

Ex opp id: 480857000007805015

Website Created Time Collection Amount Collection Date Collection value Rep Opportunity-ID
domain1 07/14/2023 09:22 AM Rs.1,500.00 07-14-2023 Rs.1,424.66 480857000010669000.00
domain2 06-08-2023 14:53 Rs.1,500.00 06-12-2023 Rs.1,500.00 480857000008994000.00
domain5 05/17/2023 08:10 AM Rs.1,600.00 05-25-2023 Rs.825.00 480857000007815000.00
domain7 06/22/2023 03:45 AM Rs.1,500.00 06-22-2023 Rs.1,500.00 480857000007805000.00
domain8 05/31/2023 01:52 PM Rs.1,500.00 05-31-2023 Rs.1,900.00 480857000007805000.00
omain9 05/16/2023 09:28 AM Rs.1,500.00 06-05-2023 Rs.1,500.00 480857000007642000.00
domain10 05-11-2023 17:23 Rs.1,500.00 05-23-2023 Rs.956.00 480857000007608000.00
domain11 04/28/2023 05:41 PM Rs.1,500.00 05-01-2023 Rs.1,500.00 480857000007180000.00
domain12 04/27/2023 10:25 PM Rs.1,500.00 03-31-2023 Rs.1,500.00 480857000007175000.00
domain13 06-01-2023 04:43 Rs.1,500.00 05-31-2023 Rs.1,500.00 480857000006993000.00