I want to make a question ...
somebody can explain me more or less how can I create one customer to different companies at the same time automatically?
I have to use Changecompany function etc... right?
You should develop some customized code in OnInsert trigger(with CHANGECOMPANY function, as you said) to "spread" the new customer in the other companies.
Of course keep in mind to manage prepagation of changes on the customer: consider also the OnModify trigger.
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Of course keep in mind to manage prepagation of changes on the customer: consider also the OnModify trigger.