Add a column without including the last 3 cells

[nachousa]

I want to add a whole column without inlcuding the last 3 cells of that column (containing numbers).
This is the code I have to add up the whole column "H" starting from "H3".
It works.

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So now I want to either subtract the last three cells or just not include them in the sum.
Is there anyway to do this?
(The number of rows varies)

[nachousa]

maybe just locate the the last cell of the range and deleted? i could do that three times... but i dont know how to do that.
any ideas?