CALCULATE INVENTORY BY FILTER

[SRBI]

Hi Guys...

I created a Dax calculation: 

SWITCH(TRUE(),[A PEDIR]<0,"OVERSTOCK","OK")

Now... I want to calculate the Total Inventory by this Criteria...then..i need 2 things: 1. Create an Slicer ("Overstock" and "Ok") or  Calculate Total Inventory by each criteria...

My real issue is not with calculation is with the Slicer or filter...

Any guide?

Thanks a lot !

[SRBI]

One more detail...

I create this formula: 

IF([OVERSTOCK]="OVERSTOCK",CALCULATE([Valor Total Inventario]),BLANK() )

But Nothing happens!

Thank You!