how to customize the invoicing screen both in A/R and A/P?

I have Sage Pro and I need to customize the Invoicing screen both in my Sales and Purchases as there are too many boxes that I do not use.  Where do I go to customize it?  I don't like to have to tab and tab in order to get to the box I want.  I work with Sage Quantum at work and it has way less boxes so i am sure it's a customization issue.  Any help would be appreciated.

Thanks in advance