Thank you for your responses so far. I do have 2 more quick questions.
(1) Can I still do a P.O. to receive merchandise, and increase stock counts? If not, what is the best way to input a shipment from my manufacturer?
(2) If I do a return on a order (partial or full), will the stock increase? So, if someone returns WIDGET for Car 2, will that increase the total WIDGET count by 1? In other words, does increasing / decreasing the count in the Wordpress Product admin also increase the count in the BOM Stock Control?