Forms :: Stock Inventory - Opening Form And Passing Data

I have a form that displays a stock inventory, one of the fields I use is called [ItemCode].

On the Stock_Inventory form I have 10 command buttons that open other forms to display additional product information.

These were previously sub_forms that sat in a tabbed control box within the Stock_Inventory Form but as it now takes a while for the form to load (lots of queries running each time you search for a product) users are getting slightly frustrated.

So, what I decided to do, was move each subform from the tabbed control into a new form and open that form when it is needed by the user.

OK, when I open Stock_Inventory and search for a product [ItemCode = "ABC123"] and then want to see the Sales_History, I have to open my new form, Stock_Inventory_Sales_History, within this form are two sub-forms, each subform has a field called [ItemCode].

However, when Stock_Inventory_Sales_History opens it asks me to input the parameter [ItemCode] twice, I presume this is because the Stock_Inventory_Sales_History does not have a record source and that the subforms need [ItemCode="ABC123"] to run each query and return the data.

I need to pass the [ItemCode] from the Stock_Inventory form to each of the 2 Subforms that are on the Stock_Inventory_Sales_History form automatically.