Two ways to create uniqueID

Use web service

Use Database

If forms not already linked to database then will have to create new form
from data connection and copy design from one to other, relink the fields and
rewrite the rules and conditional formatting.

To save the form have the button on the form that does the saving to 'rules
and custom code'.  If your form is linked to the databae you can automate the
save without code by selecting to submit data via data connection-main
connection. via the rules and then select open a new form to fill out from
the 'Actions' in the rules.

Hope this helps.

Cheers Adam

Add rules.