Ciao Guys How are you? Yes I’m newby 
I will move from another system my data (Home made by excel) and I will have for any customer invoice suffix customized.
For example:
Restaurant Mc Donald - McD 0008
PizzaHut - Pihut 00013
So customizable name and first invoice number.
Is it possible?
Thank you
Yes it is available, but everytime you come to create new sales invoice you have to select numbering series that belong to respective client, go to setup and go to naming series select sales invoice in first option
and then go to Series List for this Transaction for your case put the following info:
MC-.####
Pihut-.####
first invoice for mac will be MC-0001 and so on
i hope my bad english explained well to you 