As already stated, you have two main options - customised configuration for each client, or customised classes for each client.
The option you choose will depend on whether the customisation will be mainly different data (configuration) or different code (sub-classes).
I'm sure you would get a better answer if you provided more specifics about your problem.
In reply to Re: Electronic Billing question - where to start
by Mutant
in thread Electronic Billing question - where to start
by galitska
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