Is it possible to perform this SumIf without knowing the target range? [duplicate] - vba

Question

This question already has answers here:
How do I sum data based on a PART of the headers name?
(2 answers)
Closed 6 years ago.
This is my code so far, refer to this question as to what I am trying to do.
=SUM(IF(LEFT(C$2,4)="/111",SUM(C3,G3)))
As you can see, I am defining C2, the point of my header, and in the Sum, I am defining the sum range. I now have this question:
How do I proceed if I do not know where my header is exactly, but I
know that I'm looking for a 'part' of the header. How do I search for
this? With an HLookUp? This is because these headers may be placed in just about any order, because of this, I will need to search for the text rather than define its place.
For example, I have this table:
+-------------+-------------+-------------+-------------+-------------+
| A | B | C | D | E |
+---+-------------+-------------+-------------+-------------+-------------+
| 1 |/650 - Black |/670 - White |/800 - White |/680 - Red |/650 - Black |
+---+-------------+-------------+-------------+-------------+-------------+
| 2 | 250 | 400 | 100 | 300 | 125 |
+---+-------------+-------------+-------------+-------------+-------------+
I want to sum up the row of data where I specify the 4 character LEFT limited header, as it is in the code I posted. The problem here is that the code is more of a, "This.Cell, if it is your desired header, add stuff" when I wanted something more like "Where.Cell matches LEFT limited header, add their stuff (horizontal by other matches, not vertical) I think an Index Match is what I'm looking for, but from what I gathered, the data would have to be defined on a cell, which, as per the table above, does not contain it.
I created a separate question as I believe the requirements were not stated properly the first time, resulting in a different direction and a different answer.
Pure formula is preferred, but if VBA is what you've thought up, I'd still like to read it.
TLDR: In excel, I define several left limited headers, left limited because past the / and four digits, the rest of the text may be different. I search the sheet for these headers, and when found, I sum them up and place them at the point of this formula.
I hope I was able to clarify my requirements clearer this time!
EDIT:
So I just wanted to reiterate that the requirements of this formula is that I have no idea where my headers are located despite the table I wrote above. The idea is that I will always have a /650, a /670, or a /680. The number arrangement doesn't even matter at this point. I don't know if this is possible at all, because, since I don't know where the headers are, only what they are, I don't know what letter the cell will be on, only that it is the "cell where the header was found".
Say I want /670 and a /680. Formula finds the header /670 first, and gets its cellspace like "/670 is on C1! Therefore the number that has to be added is C2!". Proceed to the next, /680 and do the same thing. In the end, I hit enter on the formula and out comes the sum of these two headers = 700.
I'm thinking in terms of C# code where I could probably state that the range to be added is based on the letter of the header I found, no idea if excel can do this much less as a draggable formula, which is why I posted this question.

Answer 1

According to your sample table and your description this is what SUMPRODUCT is for. Sum products of arrays. Here the first array is an array of 0 or 1 where 1 is if the header matches one of the desired headers 0 if not. The second array is the array of values to sum.
So:
=SUMPRODUCT((LEFT($A$1:$E$1,4)={"/670";"/650";"/680"})*$A$2:$E$2)
will result in 1075 = 250 + 400 + 300 + 125.
The desired headers could also be given in a cell range. But this must be a column range (1 column, multiple rows). For example given the folowing
G
1 /650
2 /670
3 /680
then:
=SUMPRODUCT((LEFT($A$1:$E$1,4)=$G$1:$G$3)*$A$2:$E$2)

Answer 2

I assume, what you're looking for is an array formula which is almost the same as the one you already used:
{=SUM(IF(LEFT(A1:A3,4)="/670",B1:B3),IF(LEFT(A1:A3,4)="/680",B1:B3))}
Hit CTRL + SHIFT + ENTER