Hi Rick,
Pleased to see you looking at inventory control. It would be nice to have
A - Units in stock
B - Minimum / reorder stock level
C - Required stock level.
D - Units to order
E - Units on order
F - Parts received
G - Parts to follow
So when A drops below B it calculates the difference with C and inserts it into D.
D is available in a report as a requisition / order. when this is approved & processed to a supplier D is  automatically added to E
Upon receipt of the goods the number received is entered into F which automatically adjusts the values of A and G. and naturally resets all other fiels accordingly
Each purchase order to be given a unique PO number (it would be nice if the number reflected last 2 digits of the year, the week number and the order that week ie 081403
That is 08 the year Week 14 and the 03 is the third order raised that week but a boring old sequential number would do)
All with unit prices etc as your earlier tutorials.