Can someone help me with a report formula?  How can I get a net of the PAYMENT - REFUND for each payment type?   

I am new to LWC and cant seem to figure out how to open the source code for LWC. Aura can be opened in the dev console but from what i understand this is not possible with LWC.

Is it possible to open a LWC source code from within the org? I have a LWC that was developed by someone else that needs editing. How can I access the source code?