Some Custom Forms Questions

Good Morning

I have just installed the trial version to evaluate the product because we are searching for a product to create Helpdesk Forms.

Now I have some questions I hope you can help me solve.

First one: Is it possible to have more than one form in the portal? One for Helpdesk, One for Permission Request... etc with different form fields etc.

Second one: Can the fields be related with others, for example, if i choose a option in a field, can the other fields be able to change the displayed options?

Third one: I have found that when i choose only the view option in a custom field, requester cannot see the field, the only way to see it is if I mark the option edit, but i do not want requesters to modify some fields because I change the fields depending on the template previously chosen

Thanks in advance
Regards
Nacho

PS. Sorry about my English, Spanish is my primary language