question about income account when a sale occurs

[John Griessen]

Hello,

I mostly do service, and sometimes inventory materials and sell them.  I use 
hand written invoices often and wish to skip using a gnucash invoice on many 
simple sales of service and materials, so I create two transactions when I buy 
material, first I transfer from asset:checking to COGS, then transfer from COGS 
to asset:inventory.   When I receive a payment for that invoice, I am creating a 
split transaction with portions allocated to income:services and income:sales.


This is where I am confused...  I want to decrease inventory, so I make a 
trasaction transfer from asset:inventory to asset:checking in the amount of a 
sale, but how to have  account income:sales increase just as income:services does?

John Griessen
engineer, contractor, self employer
Austin TX