Inventory Procedure With a Modified SKU

[yoyoma]

An interesting problem. Looking for a more effective solution.

We keep inventory of blank drinking glasses. Some of these glasses get logo'd though a 3rd party vendor. Usually it's in and out, but a minority are inventoried. All current logo glasses have there own unique sku that identifies it as a specific logo glass. 

There is an additional cost to these logo glasses. 

- Currently we have a main number (blank glasses).

- We issue purchase orders to the third party vendor that does the logo job. 

We manually do inventory adjustments once the finished logo glasses come in (deduct from main sku / increase specific logo glass sku). 

Any suggestions how these can be automated better, keeping in mind that costs need to be accurately factored in ?  

We are using SAP B1.

Thanks.