Remove, subtract or exclude 1 order from an expression that counts 2 or more orders.

[matrix_user]

I have a DAX expression:

Reorders of two or more = CALCULATE(SUM(FactTable[Orders]),'FactTable[Count of duplicates orders]>=2)

that sums orders of two or more per client (rows).

For each duplicates, there is an original order.

How do I modify the DAX expression so that a subraction of 1  will exclude the original order from duplicates orders only.

When I say "duplicates", it can include 3 or more orders.

Thanks in advance.

[wdx223_Daniel]

CALCULATE(SUM(FactTable[Orders]),FILTER(ALL('FactTable[Count of duplicates orders]),'FactTable[Count of duplicates orders]-IF('FactTable[Count of duplicates orders]<2,0,1)>=2))