Actually, I don't have documents yet.

But, basically.

1) I need a first set of option that will populate the "To:" field of the email.

-Local office
---City1
---City2
---City3
---Etc.
-Central office

2)I need a second set of option that will determinate wich options will be availlable after


-Child
-Adult.

3) I need a dependant (from 2) set of options that will determine wich field to show. Also, the chosen option will populate the first part of the Object of the email.

4) finally, the text fields.
-for option 1)
---First Name
--- Last Name
---File Number:
---DOB:
---Address
--- etc.

-For option 2)
---First Name
--- Last Name
---File Number:
---DOB:
---Name of reference
---Addresse of reference
---Etc

I should have 30 differents options with common field inside, to identify the client and populate the "object". Others options are to send the information by mail to other office. I know it will be way easier to use a database but ... anyway ..

The first item can be accomplished with a simple dropdown, as can the second, but I have no idea what you mean by "that will determinate wich options will be availlable after", or what the third item is supposed to be. Items 4(1) & (2) appear to be essentially the same, except for 'Name of reference' in (2).

As for:
I think you're getting well into the kind of project for which you should be hiring a forms designer/programmer instead of expecting volunteers on forums like this to develop something so complex for you.

You should also consider whether you should use a small number of relatively simple templates instead of trying to shoehorn everything into one complex one that will be much harder for anyone at your end to maintain/update.

__________________
Cheers,
Paul Edstein
[Fmr MS MVP - Word]

I understand.

Finally, my question is how to make conditional field.

If value of field 1 is B then show field 1,2,3,20,98.