Well, to start off, there are a number of formats you can use for control plans. And, in fact, many companies combine documents. I see combination control plan - flow diagram a lot. But, as to your question...
The No. column is for an identifier. Control Plan,
FMEA, and Flow Diagram link. Think of this as a cross-reference number.
The Product column will have an entry if the characteristic is a product characteristic (eg: no burrs or 0.125 inch). The process column would be if it is a process characteristic (eg: mix ratio).
If you take a look at the AIAG
APQP manual there are several control plan examples. Check it out.
Hope this helps!