If you don't want to use PV Tables, you could try something like:
dim rngClient, rngAmount as Range
dim n as integer
set rngClient = Activeworkbook.Activeworksheet.Range("A:A")
set rngAmount = Activeworkbook.Activeworksheet.Range("B:B")
n = Activeworkbook.Activeworksheet.UsedRange.Rows().Count + 3
rngClient.Rows(n).Value = "Total"
rngAmount.Rows(n).Value = [Your filtered sum]
This should get you to where you can start entering data 3 rows after the used range.
*changed to usedrange.rows() for n
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