UI: Change existing forms and printing out from new tables

Hi,

Can you tell me how to:

in a SAP Business One standard form, add another tab, change the size and

such.

I know how to add my own forms to the menys and to develop / change in

those, but it is another matter with the standard forms,

2. How to generate at new document - like invoices for instance - from the

usertables I have created.

3. How to get the ID of the employee, to use in my forms?

4. How to write the payment of an employee to the accounting, so it will

appear as an expence?

Thanks,

Gitte