Excel: Check if cell value already exists in column, and then substract and show another value

Question

I have 2 sheets, first one with values asigned to certain names

And second one is a control list Wich I update everyday:

I want to get this updated list to show updated values while I add new rows, for example, if LEG "1" is already shown in the table, and I add a row at the bottom, value of "COR" (column D) should show value-SAL (column E). Here's an image of what i'm looking to achieve, made by hand for the example:

As you can see, in first place column D for LEG1 is 14, but as I take 7 off of it (SAL, column E) when I call the same value again in row 8, column D shows 7.

The same should happen if called it again at the bottom:

Hope you understand what I'm trying to explain, this is my first time here!

Thanks in advance.

EDIT: This is what I got until now:

----A----------B---------C
1---x----------8---------3
2---y----------9---------2
3---z----------7---------3
4---y----------7---------3
5---x----------5---------5
6---x----------5---------0
7---y----------4---------2
8---y----------2---------2
9---z----------4---------4
0---y----------2---------0

=============================================================

EDIT: I'll try to clarify even more what I'm trying to achieve:

This is the initial table that you would see. As I explain in column headers, values are called from DATA sheet, to be later modified in BASE sheet:

As values are then called again on this table, newly added rows should check previous inputs and substract them, in order to see how many "items" are available left to take (image shown below is manually edited, not actually working like this right now):

Ames answer almost got it, values are showing up as they sould (with substractions made) but there's a little "glitch" (should I call it like that?) that makes all previous values from that person change, and that isn't expected to happen:

If you know a little tweak that would make this 100% functional, would be highly appreciated.

Formula in use is: =INDICE(DATA!C$2:C$7;COINCIDIR(A2;DATA!A$2:A$7;0))-SUMAR.SI.CONJUNTO(D:D;A:A;A2)+D2

In English: =INDEX(DATA!C$2:C$7,MATCH(A2,DATA!A$2:A$7,0))-SUMIFS(D:D,A:A,A2)+D2

Thanks in advance!

Answer 1

update (fix updating previous values):

Try this - formula starting from cell D2:

=INDEX(I$2:I$7,MATCH(B2,G$2:G$7,0))-SUMIFS(E$2:E2,B$2:B2,B2)+E2

In Spanish:

=INDICE(I$2:I$7,COINCIDIR(B2,G$2:G$7,0))-SUMAR.SI.CONJUNTO(E$2:E2,B$2:B2,B2)+E2

update 2:

Based on the new tabular format.

Formula for Column B (Name):

=INDEX(G$2:G$7,MATCH(A2,F$2:F$7,0))

=INDICE(G$2:G$7,COINCIDIR(A2,F$2:F$7,0))

Formula for Column C (Left):

=INDEX(H$2:H$7,MATCH(A2,F$2:F$7,0))-SUMIFS(D$2:D2,A$2:A2,A2)+D2

=INDICE(H$2:H$7,COINCIDIR(A2,F$2:F$7,0))-SUMAR.SI.CONJUNTO(D$2:D2,A$2:A2,A2)+D2

English-Spanish Excel Function Translation

End Result:

Answer 2

give this a try. paste into cell D8.

=VLOOKUP($B8,$B:$D,3,FALSE)-SUMIFS($E$1:$E7,$B$1:$B7,B8)