Question with measure

Hi All,

I'm going to try to explain my situation because is a little bit complicate xD.

I have a "master" excel file with some data like this:

In this excel we have some columns like location code, name of location and the rest of the columns are sales amount and % of

discount depending of the quantity of the sales amount.

Then I have a dashboard with a table like this:

In this table yellow is name of client , red is sales amout and blue is the %discont depending the total sales amount.

The question is i want to change for one percentaje in excel file and that automactly applys to this table. The measure that I'm using to extract the % is:

Banda = 

VAR _banda1 = MAX(Farmacias[banda1])
VAR _banda2 = MAX(Farmacias[banda2])
VAR _banda3 = MAX(Farmacias[banda3])
VAR _banda4 = MAX(Farmacias[banda4])
VAR _banda5 = MAX(Farmacias[banda5])
VAR _banda1a = MAX(Farmacias[%banda1])
VAR _banda2a = MAX(Farmacias[%banda2])
VAR _banda3a = MAX(Farmacias[%banda3])
VAR _banda4a = MAX(Farmacias[%banda4])
VAR _banda5a = MAX(Farmacias[%banda5])
VAR _banda6a = MAX(Farmacias[%banda6])
RETURN

SWITCH(TRUE();
             ([sumcantidad]> 0 && [sumcantidad]<=_banda1); _banda1a;
             ([sumcantidad]>_banda1 && [sumcantidad]<=_banda2); _banda2a;
             ([sumcantidad]>_banda2 && [sumcantidad]<=_banda3); _banda3a;
             ([sumcantidad]>_banda3 && [sumcantidad]<=_banda4); _banda4a;
             ([sumcantidad]>_banda4 && [sumcantidad]<=_banda5); _banda5a;
             ([sumcantidad]>_banda5); _banda6a;
            0
            )

The problem here is the MAX of the variable, because for example if I change a number in one row but depending the of the number is taking the MAX. I don't know if is possible to access directy to a row , not to column.

Sorry for the explanation, really complicate to me explain this topic :-(