Okay let's see if I understand this correctly: You're looking for:
Pg 1 to 3: TOC - No numbers
===Section Break
Pg 4 to Body: Roman Numerals
===Section Break
Body: Regular Page Numbers
If this is what you need, you're going to have to double click into the header for each section, then unlink the headers and footers from the previous. By default they link. Just press the "unlink" button in the header/footer toolbar. Then format the headers and footers as you see fit. The sections before and after will have no bearing if you unlink them all.
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