How to create a service order when there is no billing

Hi,Expert！

In SAP Public Cloud 2408, I cognize that determination is simply a enactment point class "SrvItm (non-bill)" successful work orders. 
The knowing is that this volition forestall billing registration from occurring for the work bid items. 

Is it imaginable to acceptable the pursuing enactment point categories to not billing?
・External Service Item
・Stock Service Parts
・Expense Item 

If I privation to process the supra 3 point categories without invoicing(non billing), however should I acceptable it up?