Per client customisation of invoice

I would like it if i can customise each cient invoice such there is default but also i can change a invoice to suti a customer needs per each client rather than keep changing the main i default invoice style

Why start another thread on this, it has come up quite a few times before.

As i explained to glenn due to my dsylexic and th search function in this it doesnt always highlight ones i think are the same if it does i dnt create one