InfoPath Dev

We created a sharepoint forms library for a department.  We created a form with a submit button.  For whatever reason we could not get the button to point to multiple libraries.  So in the end we created a form for each library.  Currently we have approximately 50 forms for each library that we created.  Now the department ...

I have created a form with a submit that loads my data into a forms library.  Here is my question, can I setup formatting so that if certain fields are not filled in the form cannot be submitted.  If this is possible, I assuming I need do some type of conditional formatting.  I have tried some different things but cannot figure this ...