choosing from multiple GL codes on sales invoices

I have set up a COA, this has 4 different sales P&L account codes depending on which type of sale we are doing. How do I select the one I want to code to when raising a sales invoice as all I have to choose from is sales or hours and sales defaults to one of the accounts only.

I am shocked at how difficult this system is compared to Xero or Sage.  And the chat help people seem to have no knowledge of accounting whatsoever so I've given up asking them anything 😞