Hi, I am sorry for the length of the following question but I don't know another way to detail it in a better way

We purchase a product [XYZ] from a supplier.

When we receive [XYZ], we create a product [XYZ-a], the total quantity is received as stock (A), categorized 'A', and therefore, when it is sold, on the invoices assumes the name [A:XYZ-a] .

We want to move some quantity of [XYZ-a] from Stock Asset (A) to a newly created Stock Asset (B), so that we can sell from either of the two Stock Assets.

For this purpose we have created a new product called [XYZ-b] which is assigned category 'B'.

The sales from Stock Asset (B) are displayed, in fact, as [B:XYZ-b].

Just to be clear, the physical product we purchase [XYZ] is the same, whether sold as [XYZ-a] or [XYZ-b]; the two products have the same initial purchase cost and the only differences between [XYZ-a] and [XYZ-b] may be 1) in the selling price, 2) the fact that [XYZ-b] is given in consignment to some Customers, 3) the Stock Asset Account they are sold from.  

As the above requires Stock (Inventory) adjustments, so far we have used the option in the menu, called 'Stock Shrinkage', to "move" some quantities of the product [XYZ-a] from Stock Asset (A) to Stock Asset (B) as [XYZ-b] ;   

In effect, in the Stock Shrinkage form we put, for example:

[XYZ-a] change in quantity ' - 10 '

[XYZ-b] change in quantity ' +10 ' 

so we have a decrease in Stock Asset (A) and an increase in Stock Asset (B), but the total quantity of the physical product - internally and generally called [XYZ] - stays the same at the moment of such operation. We will have 10 less [XYZ-a] and 10 more [XYZ-b], which is fine as their purchasing cost is the same and from an inventory point of view, we will know exactly how many [XYZ], albeit under different names, we have in stock, whether at home or in consignment c/o some of our Customers.   

The question: is the 'Stock Shrinkage' option the best, or only, option we can use, or is there another way - simpler, not more complicated - to move the same product ( in our example [XYZ] ) from a Stock Account (A) to another stock account, (B)?

Thank you,