How to do a SUM inside a CASE WHEN clause

Question

Hi,  

 

i have created a field called PNL which is part of one main select, and it was created by using CASE WHEN clause,

 

 

 

 all is ok but, now i want to add the "Gross_Profit" value inside that field PNL with the CASE WHEN to it can be show or appears in the main Query..

 

QUESTION:

 

how can i add the new value "Gross_Profit" within CASE WHEN clause as a part of the PNL field?

 

 

 

I Hope to be clear enough...

 

Thanks---