Sorry.
First run, and re-run, the SELECT and adjust it to match what you need -- remove columns, change some values, etc.
Then you can use that SELECT to insert the reverse transactions into the #summary table.
INSERT INTO #summary
SELECT
[TicketNumber],
[Visit],
[EntityCode],
[Fiscal Year],
[Fiscal Period],
[Subsystem],
[Source Code],
[DeptSubAccount], -- needs changed?!
[Amount],
CASE WHEN [Debit/Credit] = 'C' THEN 'D' ELSE 'C' END,
[Description],
[Proj Id]
FROM #Summary