today I want to leave a short snippet on how to override methods in CreateMatrixItemsImpl graph extension. Below goes code snippet you can use for this purpose:
public class CreateMatrixItemsImplExt : PXGraphExtension<CreateMatrixItems.CreateMatrixItemsImpl, CreateMatrixItems>
public override void Initialize()
With help of this code fragment you can override and customize a bit more Matrix management of Acumatica.