How do I change inventory count with a sale?

[Dirty Jim]

I want a sales invoice to change the inventory numbers.
I also want a report (invoice) to print for only that invoice number.
How?

 

[Allen Browne]

To print just the one invoice, see:
Print the record in the form
at:
http://allenbrowne.com/casu-15.html

The other question is a much bigger one. For an introduction, see:
Inventory Control - Quantity On Hand
at:
http://allenbrowne.com/AppInventory.html