Yes, you have to be more specific and detailed to explain what you want.
What is the dialogbox you have created? Is it a Form? You can create another dialog at any time form the first form, like it was embedded. If the second dialog is a form too, you would show it like
formDialog2.Show vbModal, Me (showing it from Form1 for instance, where the Me makes the form from where you show the dialog the owner form.