Change the automatic counter for supplier and Client

Hello, 

My client would like to know if it is possible to change the beginning of the automatic counter of the Supplier and the Client to make the distinction between both in entities where they both appear?

Lets say, when I register a client, the counter starts at 1 000 000, so the next client I register takes no 1 000 001, and so on.

Same for the supplier that would start at 2 000 000, and the next supplier I save would have no 2 000 001

Thanks a lot in advance,

Laura