As suggested in the other comment it's possible but for the
Invoice or Reports for example. You could change the design of the
whole application but that would require a lot of work for sure,
but it's possible.
Hope this answers your question!
Let us know if we can help you with anything else.
I can't see to customize my own invoice template.
I am using Community edition 4.1.1
I can't seem to find the Invoice Template Generator (is it only available for Telco version?)
I tried downloading Jaspersoft Studio to open the jxrml files found in the source directory jbilling/descriptors/designs
and then Compiling to a .jasper file and then upload to production jbilling/resources/designs
and then change the invoice template in Configuration->Plugins->Notification->PDF Invoice Notification
But my edited compiled template shows a bunch of "nulls"
What's going on?